本文档描述了RFC 7230和 RFC 7231中描述的用于表示HTTP消息的公共接口，以及RFC 3986中描述的用于HTTP消息的URI 。
HTTP消息是Web开发的基础。Web浏览器和HTTP客户端（如cURL）创建发送到Web服务器的HTTP请求消息，Web服务器提供HTTP响应消息。服务器端代码接收HTTP请求消息，并返回HTTP响应消息。
HTTP消息通常是从最终用户消费者中抽象出来的，但作为开发人员，我们通常需要知道它们的结构以及如何访问或操作它们以执行我们的任务，无论是否可能向HTTP API发出请求，或处理传入的请求。
每条HTTP请求消息都有一个特定的形式：
POST /path HTTP/1.1
Host: example.com
foo=bar&baz=bat
请求的第一行是“请求行”，并按顺序包含HTTP请求方法，请求目标（通常是绝对URI或Web服务器上的路径）和HTTP协议版本。接下来是一个或多个HTTP标头，一个空行和消息体。
HTTP响应消息具有类似的结构：
HTTP/1.1 200 OK
Content-Type: text/plain
This is the response body
第一行是“状态行”，并按顺序包含HTTP协议版本，HTTP状态代码和“原因短语”，即人类可读的状态代码描述。与请求消息一样，然后是一个或多个HTTP标头，一个空行和消息体。
本文档中描述的接口是围绕HTTP消息的抽象和构成它们的元素。
本文件中的关键词“必须”，“不得”，“必须”，“应该”，“不应该”，“应该”，“不应该”，“推荐”，“可以”和“可选”按照RFC 2119中的描述进行解释。
HTTP消息是从客户端到服务器的请求或从服务器到客户端的响应。本说明书中定义了HTTP消息接口
Psr\Http\Message\RequestInterface和Psr\Http\Message\ResponseInterface分别。
两者Psr\Http\Message\RequestInterface并Psr\Http\Message\ResponseInterface延伸
Psr\Http\Message\MessageInterface。虽然Psr\Http\Message\MessageInterface可以直接实现，但实现者应该实现
Psr\Http\Message\RequestInterface和Psr\Http\Message\ResponseInterface。
从此处开始，Psr\Http\Message在引用这些接口时将省略名称空间。
HTTP消息包括不区分大小写的头字段名称。通过名称从MessageInterface以不区分大小写的方式实现的类中检索标头。例如，检索foo标头将返回与检索FoO标头相同的结果。同样，设置Foo标题将覆盖任何以前设置的foo标题值。
$message = $message->withHeader('foo', 'bar');
echo $message->getHeaderLine('foo');
// Outputs: bar
echo $message->getHeaderLine('FOO');
// Outputs: bar
$message = $message->withHeader('fOO', 'baz');
echo $message->getHeaderLine('foo');
// Outputs: baz
尽管可以不区分大小写地检索标题，但原始情况必须由实现保留，特别是在使用时检索
getHeaders()。
不符合要求的HTTP应用程序可能取决于某种情况，因此在创建请求或响应时，用户能够指示HTTP标头的大小写是有用的。
为了容纳具有多个值的标头，但仍然提供了将标头作为字符串使用的便利，可以从MessageInterface作为数组或字符串的实例中检索标头。使用此
getHeaderLine()方法将标头值检索为一个字符串，该字符串包含不区分大小写的标头的所有标头值，其名称与逗号连接。用于getHeader()按名称检索特定于大小写不敏感的标头的所有标头值的数组。
$message = $message
->withHeader('foo', 'bar')
->withAddedHeader('foo', 'baz');
$header = $message->getHeaderLine('foo');
// $header contains: 'bar, baz'
$header = $message->getHeader('foo');
// ['bar', 'baz']
注意：并非所有标头值都可以使用逗号连接（例如，
Set-Cookie）。使用这样的头时，MessageInterface基于类的消费者
应该依赖于getHeader()检索这种多值头的方法。
在请求中，Host标头通常镜像URI的主机组件，以及建立TCP连接时使用的主机。但是，HTTP规范允许Host标头与两者中的每一个不同。
在构造期间，Host如果没有提供头，实现必须尝试从提供的URI Host设置头。
RequestInterface::withUri()默认情况下，将使用Host与Host传递的主机组件匹配的标头替换返回的请求的
标头
UriInterface。
您可以Host通过传递truesecond（$preserveHost）参数来选择保留标头
的原始状态。当此参数设置为时
true，返回的请求将不会更新Host返回消息的标头 - 除非消息不包含Host标头。
该表说明了什么getHeaderLine('Host')将返回由返回的请求withUri()与$preserveHost设定参数true的各种初始请求和URI。
| 请求主机头1 | 请求主机组件2 | URI主机组件3 | 结果 |
|---|---|---|---|
| “” | “” | “” | “” |
| “” | foo.com | “” | foo.com |
| “” | foo.com | bar.com | foo.com |
| foo.com | “” | bar.com | foo.com |
| foo.com | bar.com | baz.com | foo.com |
Host操作前的1个标题值。withUri()。HTTP消息由起始行，标题和正文组成。HTTP消息的主体可能非常小或非常大。尝试将消息正文表示为字符串很容易消耗比预期更多的内存，因为正文必须完全存储在内存中。尝试将请求或响应的主体存储在内存中将阻止使用该实现来处理大型消息体。StreamInterface用于在读取或写入数据流时隐藏实现细节。对于字符串将是适当的消息实现的情况，可以使用诸如php://memory和的内置流php://temp。
StreamInterface 公开了几种方法，可以有效地读取，写入和遍历流。
数据流通过三种方式暴露自己的能力：isReadable()，
isWritable()，和isSeekable()。流协作者可以使用这些方法来确定流是否能够满足其要求。
每个流实例都具有各种功能：它可以是只读，只写或读写。它还可以允许任意随机访问（向前或向后寻找任何位置），或仅允许顺序访问（例如，在套接字，管道或基于回调的流的情况下）。
最后，StreamInterface定义一种__toString()方法来简化一次检索或发射整个身体内容。
与请求和响应接口不同，StreamInterface不模拟不变性。在包装实际PHP流的情况下，不可能实现不可变性，因为与资源交互的任何代码都可能潜在地改变其状态（包括光标位置，内容等）。我们的建议是实现使用只读流来处理服务器端请求和客户端响应。消费者应该意识到流实例可能是可变的，因此可能会改变消息的状态; 如有疑问，请创建一个新的流实例并将其附加到消息以强制执行状态。
根据RFC 7230，请求消息包含“请求目标”作为请求行的第二个段。请求目标可以是以下形式之一：
*，与OPTIONS方法一起使用，以确定Web服务器的常规功能。除了这些请求目标之外，通常还有一个与请求目标分开的“有效URL”。有效URL不在HTTP消息中传输，但它用于确定用于发出请求的协议（http / https），端口和主机名。
有效的URL由表示UriInterface。UriInterface模拟RFC 3986（主要用例）中指定的HTTP和HTTPS URI。该接口提供了与各种URI部分交互的方法，这将消除重复解析URI的需要。它还指定了__toString()
将建模URI转换为其字符串表示形式的方法。
在检索请求目标时getRequestTarget()，默认情况下，此方法将使用URI对象并提取所有必要的组件来构造原始表单。的起源形式是目前最常见的请求目标。
如果最终用户希望使用其他三种表单中的一种，或者如果用户想要显式覆盖请求目标，则可以使用withRequestTarget()。
调用此方法不会影响URI，因为它是从中返回的getUri()。
例如，用户可能希望向服务器发出星号形式的请求：
$request = $request
->withMethod('OPTIONS')
->withRequestTarget('*')
->withUri(new Uri('https://example.org/'));
此示例最终可能会导致HTTP请求如下所示：
OPTIONS * HTTP/1.1
但HTTP客户端将能够使用有效的URL（来自getUri()），来确定协议，主机名和TCP端口。
HTTP客户端必须忽略的值Uri::getPath()和Uri::getQuery()，而是使用由返回的值getRequestTarget()，默认为串联这两个值。
选择不实现4个请求目标表单中的一个或多个的客户端必须仍然使用getRequestTarget()。这些客户端必须拒绝他们不支持的请求目标，并且绝不能依赖于它们的值getUri()。
RequestInterface提供了使用提供的请求目标检索请求目标或创建新实例的方法。默认情况下，如果实例中没有专门组合请求目标，getRequestTarget()
则返回组合URI的原始形式（如果没有组成URI ，则返回“/”）。
withRequestTarget($requestTarget)使用指定的请求目标创建新实例，从而允许开发人员创建表示其他三个请求目标表单（绝对表单，权限表单和星号表单）的请求消息。使用时，组合的URI实例仍然可以使用，特别是在客户端中，它可以用于创建与服务器的连接。
RequestInterface提供HTTP请求消息的一般表示。但是，由于服务器端环境的性质，服务器端请求需要额外的处理。服务器端处理需要考虑通用网关接口（CGI），更具体地说，需要考虑PHP通过其服务器API（SAPI）对CGI的抽象和扩展。PHP通过超级全局提供了关于输入编组的简化，例如：
$_COOKIE，反序列化并提供对HTTP cookie的简化访问。$_GET，反序列化并提供对查询字符串参数的简化访问。$_POST，对通过HTTP POST提交的urlencoded参数进行反序列化并提供简化访问; 通常，它可以被认为是解析消息体的结果。$_FILES，提供有关文件上传的序列化元数据。$_SERVER，它提供对CGI / SAPI环境变量的访问，这些变量通常包括请求方法，请求方案，请求URI和标头。ServerRequestInterface扩展RequestInterface为提供围绕这些各种超级全球的抽象。这种做法有助于减少消费者与超全球的耦合，并鼓励和提升测试请求消费者的能力。
服务器请求提供了一个附加属性“属性”，以允许消费者根据特定于应用程序的规则（例如路径匹配，方案匹配，主机匹配等）内省，分解和匹配请求。因此，服务器请求还可以在多个请求消费者之间提供消息传递。
ServerRequestInterface指定用于在规范化结构中检索上载文件树的方法，每个叶子是一个实例
UploadedFileInterface。
$_FILES在处理文件输入数组时，超全局存在一些众所周知的问题。例如，如果您有一个提交文件数组的表单 - 例如，输入名称“files”，则提交files[0]和files[1]- PHP将表示为：
array(
'files' => array(
'name' => array(
0 => 'file0.txt',
1 => 'file1.html',
),
'type' => array(
0 => 'text/plain',
1 => 'text/html',
),
/* etc. */
),
)
而不是预期的：
array(
'files' => array(
0 => array(
'name' => 'file0.txt',
'type' => 'text/plain',
/* etc. */
),
1 => array(
'name' => 'file1.html',
'type' => 'text/html',
/* etc. */
),
),
)
结果是消费者需要知道这种语言实现细节，并编写用于收集给定上载数据的代码。
此外，存在$_FILES文件上载发生时未填充的方案：
POST。在这种情况下，数据需要以不同方式播种。例如：
getUploadedFiles()为消费者提供标准化结构。实施预计将：
Psr\Http\Message\UploadedFileInterface实例。Psr\Http\Message\UploadedFileInterface树中给定位置的适当
实例。引用的树结构应该模仿提交文件的命名结构。
在最简单的示例中，这可能是提交的单个命名表单元素：
<input type="file" name="avatar" />
在这种情况下，结构$_FILES将如下所示：
array(
'avatar' => array(
'tmp_name' => 'phpUxcOty',
'name' => 'my-avatar.png',
'size' => 90996,
'type' => 'image/png',
'error' => 0,
),
)
返回的规范化表单getUploadedFiles()将是：
array(
'avatar' => /* UploadedFileInterface instance */
)
对于使用数组表示法输入名称的输入：
<input type="file" name="my-form[details][avatar]" />
$_FILES 最终看起来像这样：
array (
'my-form' => array (
'name' => array (
'details' => array (
'avatar' => 'my-avatar.png',
),
),
'type' => array (
'details' => array (
'avatar' => 'image/png',
),
),
'tmp_name' => array (
'details' => array (
'avatar' => 'phpmFLrzD',
),
),
'error' => array (
'details' => array (
'avatar' => 0,
),
),
'size' => array (
'details' => array (
'avatar' => 90996,
),
),
),
)
返回的相应树getUploadedFiles()应该是：
array(
'my-form' => array(
'details' => array(
'avatar' => /* UploadedFileInterface instance */
),
),
)
在某些情况下，您可以指定一个文件数组：
Upload an avatar: <input type="file" name="my-form[details][avatars][]" />
Upload an avatar: <input type="file" name="my-form[details][avatars][]" />
（例如，JavaScript控件可能会产生额外的文件上传输入，以允许一次上传多个文件。）
在这种情况下，规范实现必须聚合与给定索引处的文件相关的所有信息。原因是$_FILES在这种情况下偏离其正常结构：
array (
'my-form' => array (
'name' => array (
'details' => array (
'avatar' => array (
0 => 'my-avatar.png',
1 => 'my-avatar2.png',
2 => 'my-avatar3.png',
),
),
),
'type' => array (
'details' => array (
'avatar' => array (
0 => 'image/png',
1 => 'image/png',
2 => 'image/png',
),
),
),
'tmp_name' => array (
'details' => array (
'avatar' => array (
0 => 'phpmFLrzD',
1 => 'phpV2pBil',
2 => 'php8RUG8v',
),
),
),
'error' => array (
'details' => array (
'avatar' => array (
0 => 0,
1 => 0,
2 => 0,
),
),
),
'size' => array (
'details' => array (
'avatar' => array (
0 => 90996,
1 => 90996,
3 => 90996,
),
),
),
),
)
上面的$_FILES数组将对应于以下返回的结构getUploadedFiles()：
array(
'my-form' => array(
'details' => array(
'avatars' => array(
0 => /* UploadedFileInterface instance */,
1 => /* UploadedFileInterface instance */,
2 => /* UploadedFileInterface instance */,
),
),
),
)
消费者将使用以下方法访问1嵌套数组的索引：
$request->getUploadedFiles()['my-form']['details']['avatars'][1];
由于上传的文件数据是派生的（从$_FILES请求体派生或者是从请求体派生），withUploadedFiles()因此接口中也存在mutator方法，允许将规范化委托给另一个进程。
在原始示例的情况下，消费类似于以下内容：
$file0 = $request->getUploadedFiles()['files'][0];
$file1 = $request->getUploadedFiles()['files'][1];
printf(
"Received the files %s and %s",
$file0->getClientFilename(),
$file1->getClientFilename()
);
// "Received the files file0.txt and file1.html"
该提案还认识到实现可以在非SAPI环境中运行。因此，UploadedFileInterface提供了用于确保操作无论环境如何都可以工作的方法。特别是：
moveTo($targetPath)提供作为move_uploaded_file()直接调用临时上载文件的安全和建议的替代方法
。实现将根据环境检测正确的操作。getStream()将返回一个StreamInterface实例。在非SAPI环境中，提出的一种可能性是将单个上载文件解析为php://temp流而不是直接解析为文件; 在这种情况下，不存在上传文件。getStream()因此，无论环境如何，都可以保证工作。例如：
// Move a file to an upload directory
$filename = sprintf(
'%s.%s',
create_uuid(),
pathinfo($file0->getClientFilename(), PATHINFO_EXTENSION)
);
$file0->moveTo(DATA_DIR . '/' . $filename);
// Stream a file to Amazon S3.
// Assume $s3wrapper is a PHP stream that will write to S3, and that
// Psr7StreamWrapper is a class that will decorate a StreamInterface as a PHP
// StreamWrapper.
$stream = new Psr7StreamWrapper($file1->getStream());
stream_copy_to_stream($stream, $s3wrapper);
所描述的接口和类作为psr / http-message包的一部分提供 。
<?php
namespace Psr\Http\Message;
/**
* HTTP messages consist of requests from a client to a server and responses
* from a server to a client. This interface defines the methods common to
* each.
*
* Messages are considered immutable; all methods that might change state MUST
* be implemented such that they retain the internal state of the current
* message and return an instance that contains the changed state.
*
* @see http://www.ietf.org/rfc/rfc7230.txt
* @see http://www.ietf.org/rfc/rfc7231.txt
*/
interface MessageInterface
{
/**
* Retrieves the HTTP protocol version as a string.
*
* The string MUST contain only the HTTP version number (e.g., "1.1", "1.0").
*
* @return string HTTP protocol version.
*/
public function getProtocolVersion();
/**
* Return an instance with the specified HTTP protocol version.
*
* The version string MUST contain only the HTTP version number (e.g.,
* "1.1", "1.0").
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new protocol version.
*
* @param string $version HTTP protocol version
* @return static
*/
public function withProtocolVersion($version);
/**
* Retrieves all message header values.
*
* The keys represent the header name as it will be sent over the wire, and
* each value is an array of strings associated with the header.
*
* // Represent the headers as a string
* foreach ($message->getHeaders() as $name => $values) {
* echo $name . ': ' . implode(', ', $values);
* }
*
* // Emit headers iteratively:
* foreach ($message->getHeaders() as $name => $values) {
* foreach ($values as $value) {
* header(sprintf('%s: %s', $name, $value), false);
* }
* }
*
* While header names are not case-sensitive, getHeaders() will preserve the
* exact case in which headers were originally specified.
*
* @return string[][] Returns an associative array of the message's headers.
* Each key MUST be a header name, and each value MUST be an array of
* strings for that header.
*/
public function getHeaders();
/**
* Checks if a header exists by the given case-insensitive name.
*
* @param string $name Case-insensitive header field name.
* @return bool Returns true if any header names match the given header
* name using a case-insensitive string comparison. Returns false if
* no matching header name is found in the message.
*/
public function hasHeader($name);
/**
* Retrieves a message header value by the given case-insensitive name.
*
* This method returns an array of all the header values of the given
* case-insensitive header name.
*
* If the header does not appear in the message, this method MUST return an
* empty array.
*
* @param string $name Case-insensitive header field name.
* @return string[] An array of string values as provided for the given
* header. If the header does not appear in the message, this method MUST
* return an empty array.
*/
public function getHeader($name);
/**
* Retrieves a comma-separated string of the values for a single header.
*
* This method returns all of the header values of the given
* case-insensitive header name as a string concatenated together using
* a comma.
*
* NOTE: Not all header values may be appropriately represented using
* comma concatenation. For such headers, use getHeader() instead
* and supply your own delimiter when concatenating.
*
* If the header does not appear in the message, this method MUST return
* an empty string.
*
* @param string $name Case-insensitive header field name.
* @return string A string of values as provided for the given header
* concatenated together using a comma. If the header does not appear in
* the message, this method MUST return an empty string.
*/
public function getHeaderLine($name);
/**
* Return an instance with the provided value replacing the specified header.
*
* While header names are case-insensitive, the casing of the header will
* be preserved by this function, and returned from getHeaders().
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new and/or updated header and value.
*
* @param string $name Case-insensitive header field name.
* @param string|string[] $value Header value(s).
* @return static
* @throws \InvalidArgumentException for invalid header names or values.
*/
public function withHeader($name, $value);
/**
* Return an instance with the specified header appended with the given value.
*
* Existing values for the specified header will be maintained. The new
* value(s) will be appended to the existing list. If the header did not
* exist previously, it will be added.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new header and/or value.
*
* @param string $name Case-insensitive header field name to add.
* @param string|string[] $value Header value(s).
* @return static
* @throws \InvalidArgumentException for invalid header names.
* @throws \InvalidArgumentException for invalid header values.
*/
public function withAddedHeader($name, $value);
/**
* Return an instance without the specified header.
*
* Header resolution MUST be done without case-sensitivity.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that removes
* the named header.
*
* @param string $name Case-insensitive header field name to remove.
* @return static
*/
public function withoutHeader($name);
/**
* Gets the body of the message.
*
* @return StreamInterface Returns the body as a stream.
*/
public function getBody();
/**
* Return an instance with the specified message body.
*
* The body MUST be a StreamInterface object.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return a new instance that has the
* new body stream.
*
* @param StreamInterface $body Body.
* @return static
* @throws \InvalidArgumentException When the body is not valid.
*/
public function withBody(StreamInterface $body);
}
<?php
namespace Psr\Http\Message;
/**
* Representation of an outgoing, client-side request.
*
* Per the HTTP specification, this interface includes properties for
* each of the following:
*
* - Protocol version
* - HTTP method
* - URI
* - Headers
* - Message body
*
* During construction, implementations MUST attempt to set the Host header from
* a provided URI if no Host header is provided.
*
* Requests are considered immutable; all methods that might change state MUST
* be implemented such that they retain the internal state of the current
* message and return an instance that contains the changed state.
*/
interface RequestInterface extends MessageInterface
{
/**
* Retrieves the message's request target.
*
* Retrieves the message's request-target either as it will appear (for
* clients), as it appeared at request (for servers), or as it was
* specified for the instance (see withRequestTarget()).
*
* In most cases, this will be the origin-form of the composed URI,
* unless a value was provided to the concrete implementation (see
* withRequestTarget() below).
*
* If no URI is available, and no request-target has been specifically
* provided, this method MUST return the string "/".
*
* @return string
*/
public function getRequestTarget();
/**
* Return an instance with the specific request-target.
*
* If the request needs a non-origin-form request-target — e.g., for
* specifying an absolute-form, authority-form, or asterisk-form —
* this method may be used to create an instance with the specified
* request-target, verbatim.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* changed request target.
*
* @see http://tools.ietf.org/html/rfc7230#section-5.3 (for the various
* request-target forms allowed in request messages)
* @param mixed $requestTarget
* @return static
*/
public function withRequestTarget($requestTarget);
/**
* Retrieves the HTTP method of the request.
*
* @return string Returns the request method.
*/
public function getMethod();
/**
* Return an instance with the provided HTTP method.
*
* While HTTP method names are typically all uppercase characters, HTTP
* method names are case-sensitive and thus implementations SHOULD NOT
* modify the given string.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* changed request method.
*
* @param string $method Case-sensitive method.
* @return static
* @throws \InvalidArgumentException for invalid HTTP methods.
*/
public function withMethod($method);
/**
* Retrieves the URI instance.
*
* This method MUST return a UriInterface instance.
*
* @see http://tools.ietf.org/html/rfc3986#section-4.3
* @return UriInterface Returns a UriInterface instance
* representing the URI of the request.
*/
public function getUri();
/**
* Returns an instance with the provided URI.
*
* This method MUST update the Host header of the returned request by
* default if the URI contains a host component. If the URI does not
* contain a host component, any pre-existing Host header MUST be carried
* over to the returned request.
*
* You can opt-in to preserving the original state of the Host header by
* setting `$preserveHost` to `true`. When `$preserveHost` is set to
* `true`, this method interacts with the Host header in the following ways:
*
* - If the Host header is missing or empty, and the new URI contains
* a host component, this method MUST update the Host header in the returned
* request.
* - If the Host header is missing or empty, and the new URI does not contain a
* host component, this method MUST NOT update the Host header in the returned
* request.
* - If a Host header is present and non-empty, this method MUST NOT update
* the Host header in the returned request.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new UriInterface instance.
*
* @see http://tools.ietf.org/html/rfc3986#section-4.3
* @param UriInterface $uri New request URI to use.
* @param bool $preserveHost Preserve the original state of the Host header.
* @return static
*/
public function withUri(UriInterface $uri, $preserveHost = false);
}
<?php
namespace Psr\Http\Message;
/**
* Representation of an incoming, server-side HTTP request.
*
* Per the HTTP specification, this interface includes properties for
* each of the following:
*
* - Protocol version
* - HTTP method
* - URI
* - Headers
* - Message body
*
* Additionally, it encapsulates all data as it has arrived at the
* application from the CGI and/or PHP environment, including:
*
* - The values represented in $_SERVER.
* - Any cookies provided (generally via $_COOKIE)
* - Query string arguments (generally via $_GET, or as parsed via parse_str())
* - Upload files, if any (as represented by $_FILES)
* - Deserialized body parameters (generally from $_POST)
*
* $_SERVER values MUST be treated as immutable, as they represent application
* state at the time of request; as such, no methods are provided to allow
* modification of those values. The other values provide such methods, as they
* can be restored from $_SERVER or the request body, and may need treatment
* during the application (e.g., body parameters may be deserialized based on
* content type).
*
* Additionally, this interface recognizes the utility of introspecting a
* request to derive and match additional parameters (e.g., via URI path
* matching, decrypting cookie values, deserializing non-form-encoded body
* content, matching authorization headers to users, etc). These parameters
* are stored in an "attributes" property.
*
* Requests are considered immutable; all methods that might change state MUST
* be implemented such that they retain the internal state of the current
* message and return an instance that contains the changed state.
*/
interface ServerRequestInterface extends RequestInterface
{
/**
* Retrieve server parameters.
*
* Retrieves data related to the incoming request environment,
* typically derived from PHP's $_SERVER superglobal. The data IS NOT
* REQUIRED to originate from $_SERVER.
*
* @return array
*/
public function getServerParams();
/**
* Retrieve cookies.
*
* Retrieves cookies sent by the client to the server.
*
* The data MUST be compatible with the structure of the $_COOKIE
* superglobal.
*
* @return array
*/
public function getCookieParams();
/**
* Return an instance with the specified cookies.
*
* The data IS NOT REQUIRED to come from the $_COOKIE superglobal, but MUST
* be compatible with the structure of $_COOKIE. Typically, this data will
* be injected at instantiation.
*
* This method MUST NOT update the related Cookie header of the request
* instance, nor related values in the server params.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* updated cookie values.
*
* @param array $cookies Array of key/value pairs representing cookies.
* @return static
*/
public function withCookieParams(array $cookies);
/**
* Retrieve query string arguments.
*
* Retrieves the deserialized query string arguments, if any.
*
* Note: the query params might not be in sync with the URI or server
* params. If you need to ensure you are only getting the original
* values, you may need to parse the query string from `getUri()->getQuery()`
* or from the `QUERY_STRING` server param.
*
* @return array
*/
public function getQueryParams();
/**
* Return an instance with the specified query string arguments.
*
* These values SHOULD remain immutable over the course of the incoming
* request. They MAY be injected during instantiation, such as from PHP's
* $_GET superglobal, or MAY be derived from some other value such as the
* URI. In cases where the arguments are parsed from the URI, the data
* MUST be compatible with what PHP's parse_str() would return for
* purposes of how duplicate query parameters are handled, and how nested
* sets are handled.
*
* Setting query string arguments MUST NOT change the URI stored by the
* request, nor the values in the server params.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* updated query string arguments.
*
* @param array $query Array of query string arguments, typically from
* $_GET.
* @return static
*/
public function withQueryParams(array $query);
/**
* Retrieve normalized file upload data.
*
* This method returns upload metadata in a normalized tree, with each leaf
* an instance of Psr\Http\Message\UploadedFileInterface.
*
* These values MAY be prepared from $_FILES or the message body during
* instantiation, or MAY be injected via withUploadedFiles().
*
* @return array An array tree of UploadedFileInterface instances; an empty
* array MUST be returned if no data is present.
*/
public function getUploadedFiles();
/**
* Create a new instance with the specified uploaded files.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* updated body parameters.
*
* @param array $uploadedFiles An array tree of UploadedFileInterface instances.
* @return static
* @throws \InvalidArgumentException if an invalid structure is provided.
*/
public function withUploadedFiles(array $uploadedFiles);
/**
* Retrieve any parameters provided in the request body.
*
* If the request Content-Type is either application/x-www-form-urlencoded
* or multipart/form-data, and the request method is POST, this method MUST
* return the contents of $_POST.
*
* Otherwise, this method may return any results of deserializing
* the request body content; as parsing returns structured content, the
* potential types MUST be arrays or objects only. A null value indicates
* the absence of body content.
*
* @return null|array|object The deserialized body parameters, if any.
* These will typically be an array or object.
*/
public function getParsedBody();
/**
* Return an instance with the specified body parameters.
*
* These MAY be injected during instantiation.
*
* If the request Content-Type is either application/x-www-form-urlencoded
* or multipart/form-data, and the request method is POST, use this method
* ONLY to inject the contents of $_POST.
*
* The data IS NOT REQUIRED to come from $_POST, but MUST be the results of
* deserializing the request body content. Deserialization/parsing returns
* structured data, and, as such, this method ONLY accepts arrays or objects,
* or a null value if nothing was available to parse.
*
* As an example, if content negotiation determines that the request data
* is a JSON payload, this method could be used to create a request
* instance with the deserialized parameters.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* updated body parameters.
*
* @param null|array|object $data The deserialized body data. This will
* typically be in an array or object.
* @return static
* @throws \InvalidArgumentException if an unsupported argument type is
* provided.
*/
public function withParsedBody($data);
/**
* Retrieve attributes derived from the request.
*
* The request "attributes" may be used to allow injection of any
* parameters derived from the request: e.g., the results of path
* match operations; the results of decrypting cookies; the results of
* deserializing non-form-encoded message bodies; etc. Attributes
* will be application and request specific, and CAN be mutable.
*
* @return mixed[] Attributes derived from the request.
*/
public function getAttributes();
/**
* Retrieve a single derived request attribute.
*
* Retrieves a single derived request attribute as described in
* getAttributes(). If the attribute has not been previously set, returns
* the default value as provided.
*
* This method obviates the need for a hasAttribute() method, as it allows
* specifying a default value to return if the attribute is not found.
*
* @see getAttributes()
* @param string $name The attribute name.
* @param mixed $default Default value to return if the attribute does not exist.
* @return mixed
*/
public function getAttribute($name, $default = null);
/**
* Return an instance with the specified derived request attribute.
*
* This method allows setting a single derived request attribute as
* described in getAttributes().
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* updated attribute.
*
* @see getAttributes()
* @param string $name The attribute name.
* @param mixed $value The value of the attribute.
* @return static
*/
public function withAttribute($name, $value);
/**
* Return an instance that removes the specified derived request attribute.
*
* This method allows removing a single derived request attribute as
* described in getAttributes().
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that removes
* the attribute.
*
* @see getAttributes()
* @param string $name The attribute name.
* @return static
*/
public function withoutAttribute($name);
}
<?php
namespace Psr\Http\Message;
/**
* Representation of an outgoing, server-side response.
*
* Per the HTTP specification, this interface includes properties for
* each of the following:
*
* - Protocol version
* - Status code and reason phrase
* - Headers
* - Message body
*
* Responses are considered immutable; all methods that might change state MUST
* be implemented such that they retain the internal state of the current
* message and return an instance that contains the changed state.
*/
interface ResponseInterface extends MessageInterface
{
/**
* Gets the response status code.
*
* The status code is a 3-digit integer result code of the server's attempt
* to understand and satisfy the request.
*
* @return int Status code.
*/
public function getStatusCode();
/**
* Return an instance with the specified status code and, optionally, reason phrase.
*
* If no reason phrase is specified, implementations MAY choose to default
* to the RFC 7231 or IANA recommended reason phrase for the response's
* status code.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* updated status and reason phrase.
*
* @see http://tools.ietf.org/html/rfc7231#section-6
* @see http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
* @param int $code The 3-digit integer result code to set.
* @param string $reasonPhrase The reason phrase to use with the
* provided status code; if none is provided, implementations MAY
* use the defaults as suggested in the HTTP specification.
* @return static
* @throws \InvalidArgumentException For invalid status code arguments.
*/
public function withStatus($code, $reasonPhrase = '');
/**
* Gets the response reason phrase associated with the status code.
*
* Because a reason phrase is not a required element in a response
* status line, the reason phrase value MAY be empty. Implementations MAY
* choose to return the default RFC 7231 recommended reason phrase (or those
* listed in the IANA HTTP Status Code Registry) for the response's
* status code.
*
* @see http://tools.ietf.org/html/rfc7231#section-6
* @see http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
* @return string Reason phrase; must return an empty string if none present.
*/
public function getReasonPhrase();
}
<?php
namespace Psr\Http\Message;
/**
* Describes a data stream.
*
* Typically, an instance will wrap a PHP stream; this interface provides
* a wrapper around the most common operations, including serialization of
* the entire stream to a string.
*/
interface StreamInterface
{
/**
* Reads all data from the stream into a string, from the beginning to end.
*
* This method MUST attempt to seek to the beginning of the stream before
* reading data and read the stream until the end is reached.
*
* Warning: This could attempt to load a large amount of data into memory.
*
* This method MUST NOT raise an exception in order to conform with PHP's
* string casting operations.
*
* @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
* @return string
*/
public function __toString();
/**
* Closes the stream and any underlying resources.
*
* @return void
*/
public function close();
/**
* Separates any underlying resources from the stream.
*
* After the stream has been detached, the stream is in an unusable state.
*
* @return resource|null Underlying PHP stream, if any
*/
public function detach();
/**
* Get the size of the stream if known.
*
* @return int|null Returns the size in bytes if known, or null if unknown.
*/
public function getSize();
/**
* Returns the current position of the file read/write pointer
*
* @return int Position of the file pointer
* @throws \RuntimeException on error.
*/
public function tell();
/**
* Returns true if the stream is at the end of the stream.
*
* @return bool
*/
public function eof();
/**
* Returns whether or not the stream is seekable.
*
* @return bool
*/
public function isSeekable();
/**
* Seek to a position in the stream.
*
* @see http://www.php.net/manual/en/function.fseek.php
* @param int $offset Stream offset
* @param int $whence Specifies how the cursor position will be calculated
* based on the seek offset. Valid values are identical to the built-in
* PHP $whence values for `fseek()`. SEEK_SET: Set position equal to
* offset bytes SEEK_CUR: Set position to current location plus offset
* SEEK_END: Set position to end-of-stream plus offset.
* @throws \RuntimeException on failure.
*/
public function seek($offset, $whence = SEEK_SET);
/**
* Seek to the beginning of the stream.
*
* If the stream is not seekable, this method will raise an exception;
* otherwise, it will perform a seek(0).
*
* @see seek()
* @see http://www.php.net/manual/en/function.fseek.php
* @throws \RuntimeException on failure.
*/
public function rewind();
/**
* Returns whether or not the stream is writable.
*
* @return bool
*/
public function isWritable();
/**
* Write data to the stream.
*
* @param string $string The string that is to be written.
* @return int Returns the number of bytes written to the stream.
* @throws \RuntimeException on failure.
*/
public function write($string);
/**
* Returns whether or not the stream is readable.
*
* @return bool
*/
public function isReadable();
/**
* Read data from the stream.
*
* @param int $length Read up to $length bytes from the object and return
* them. Fewer than $length bytes may be returned if underlying stream
* call returns fewer bytes.
* @return string Returns the data read from the stream, or an empty string
* if no bytes are available.
* @throws \RuntimeException if an error occurs.
*/
public function read($length);
/**
* Returns the remaining contents in a string
*
* @return string
* @throws \RuntimeException if unable to read.
* @throws \RuntimeException if error occurs while reading.
*/
public function getContents();
/**
* Get stream metadata as an associative array or retrieve a specific key.
*
* The keys returned are identical to the keys returned from PHP's
* stream_get_meta_data() function.
*
* @see http://php.net/manual/en/function.stream-get-meta-data.php
* @param string $key Specific metadata to retrieve.
* @return array|mixed|null Returns an associative array if no key is
* provided. Returns a specific key value if a key is provided and the
* value is found, or null if the key is not found.
*/
public function getMetadata($key = null);
}
<?php
namespace Psr\Http\Message;
/**
* Value object representing a URI.
*
* This interface is meant to represent URIs according to RFC 3986 and to
* provide methods for most common operations. Additional functionality for
* working with URIs can be provided on top of the interface or externally.
* Its primary use is for HTTP requests, but may also be used in other
* contexts.
*
* Instances of this interface are considered immutable; all methods that
* might change state MUST be implemented such that they retain the internal
* state of the current instance and return an instance that contains the
* changed state.
*
* Typically the Host header will also be present in the request message.
* For server-side requests, the scheme will typically be discoverable in the
* server parameters.
*
* @see http://tools.ietf.org/html/rfc3986 (the URI specification)
*/
interface UriInterface
{
/**
* Retrieve the scheme component of the URI.
*
* If no scheme is present, this method MUST return an empty string.
*
* The value returned MUST be normalized to lowercase, per RFC 3986
* Section 3.1.
*
* The trailing ":" character is not part of the scheme and MUST NOT be
* added.
*
* @see https://tools.ietf.org/html/rfc3986#section-3.1
* @return string The URI scheme.
*/
public function getScheme();
/**
* Retrieve the authority component of the URI.
*
* If no authority information is present, this method MUST return an empty
* string.
*
* The authority syntax of the URI is:
*
* <pre>
* [user-info@]host[:port]
* </pre>
*
* If the port component is not set or is the standard port for the current
* scheme, it SHOULD NOT be included.
*
* @see https://tools.ietf.org/html/rfc3986#section-3.2
* @return string The URI authority, in "[user-info@]host[:port]" format.
*/
public function getAuthority();
/**
* Retrieve the user information component of the URI.
*
* If no user information is present, this method MUST return an empty
* string.
*
* If a user is present in the URI, this will return that value;
* additionally, if the password is also present, it will be appended to the
* user value, with a colon (":") separating the values.
*
* The trailing "@" character is not part of the user information and MUST
* NOT be added.
*
* @return string The URI user information, in "username[:password]" format.
*/
public function getUserInfo();
/**
* Retrieve the host component of the URI.
*
* If no host is present, this method MUST return an empty string.
*
* The value returned MUST be normalized to lowercase, per RFC 3986
* Section 3.2.2.
*
* @see http://tools.ietf.org/html/rfc3986#section-3.2.2
* @return string The URI host.
*/
public function getHost();
/**
* Retrieve the port component of the URI.
*
* If a port is present, and it is non-standard for the current scheme,
* this method MUST return it as an integer. If the port is the standard port
* used with the current scheme, this method SHOULD return null.
*
* If no port is present, and no scheme is present, this method MUST return
* a null value.
*
* If no port is present, but a scheme is present, this method MAY return
* the standard port for that scheme, but SHOULD return null.
*
* @return null|int The URI port.
*/
public function getPort();
/**
* Retrieve the path component of the URI.
*
* The path can either be empty or absolute (starting with a slash) or
* rootless (not starting with a slash). Implementations MUST support all
* three syntaxes.
*
* Normally, the empty path "" and absolute path "/" are considered equal as
* defined in RFC 7230 Section 2.7.3. But this method MUST NOT automatically
* do this normalization because in contexts with a trimmed base path, e.g.
* the front controller, this difference becomes significant. It's the task
* of the user to handle both "" and "/".
*
* The value returned MUST be percent-encoded, but MUST NOT double-encode
* any characters. To determine what characters to encode, please refer to
* RFC 3986, Sections 2 and 3.3.
*
* As an example, if the value should include a slash ("/") not intended as
* delimiter between path segments, that value MUST be passed in encoded
* form (e.g., "%2F") to the instance.
*
* @see https://tools.ietf.org/html/rfc3986#section-2
* @see https://tools.ietf.org/html/rfc3986#section-3.3
* @return string The URI path.
*/
public function getPath();
/**
* Retrieve the query string of the URI.
*
* If no query string is present, this method MUST return an empty string.
*
* The leading "?" character is not part of the query and MUST NOT be
* added.
*
* The value returned MUST be percent-encoded, but MUST NOT double-encode
* any characters. To determine what characters to encode, please refer to
* RFC 3986, Sections 2 and 3.4.
*
* As an example, if a value in a key/value pair of the query string should
* include an ampersand ("&") not intended as a delimiter between values,
* that value MUST be passed in encoded form (e.g., "%26") to the instance.
*
* @see https://tools.ietf.org/html/rfc3986#section-2
* @see https://tools.ietf.org/html/rfc3986#section-3.4
* @return string The URI query string.
*/
public function getQuery();
/**
* Retrieve the fragment component of the URI.
*
* If no fragment is present, this method MUST return an empty string.
*
* The leading "#" character is not part of the fragment and MUST NOT be
* added.
*
* The value returned MUST be percent-encoded, but MUST NOT double-encode
* any characters. To determine what characters to encode, please refer to
* RFC 3986, Sections 2 and 3.5.
*
* @see https://tools.ietf.org/html/rfc3986#section-2
* @see https://tools.ietf.org/html/rfc3986#section-3.5
* @return string The URI fragment.
*/
public function getFragment();
/**
* Return an instance with the specified scheme.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified scheme.
*
* Implementations MUST support the schemes "http" and "https" case
* insensitively, and MAY accommodate other schemes if required.
*
* An empty scheme is equivalent to removing the scheme.
*
* @param string $scheme The scheme to use with the new instance.
* @return static A new instance with the specified scheme.
* @throws \InvalidArgumentException for invalid schemes.
* @throws \InvalidArgumentException for unsupported schemes.
*/
public function withScheme($scheme);
/**
* Return an instance with the specified user information.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified user information.
*
* Password is optional, but the user information MUST include the
* user; an empty string for the user is equivalent to removing user
* information.
*
* @param string $user The user name to use for authority.
* @param null|string $password The password associated with $user.
* @return static A new instance with the specified user information.
*/
public function withUserInfo($user, $password = null);
/**
* Return an instance with the specified host.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified host.
*
* An empty host value is equivalent to removing the host.
*
* @param string $host The hostname to use with the new instance.
* @return static A new instance with the specified host.
* @throws \InvalidArgumentException for invalid hostnames.
*/
public function withHost($host);
/**
* Return an instance with the specified port.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified port.
*
* Implementations MUST raise an exception for ports outside the
* established TCP and UDP port ranges.
*
* A null value provided for the port is equivalent to removing the port
* information.
*
* @param null|int $port The port to use with the new instance; a null value
* removes the port information.
* @return static A new instance with the specified port.
* @throws \InvalidArgumentException for invalid ports.
*/
public function withPort($port);
/**
* Return an instance with the specified path.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified path.
*
* The path can either be empty or absolute (starting with a slash) or
* rootless (not starting with a slash). Implementations MUST support all
* three syntaxes.
*
* If an HTTP path is intended to be host-relative rather than path-relative
* then it must begin with a slash ("/"). HTTP paths not starting with a slash
* are assumed to be relative to some base path known to the application or
* consumer.
*
* Users can provide both encoded and decoded path characters.
* Implementations ensure the correct encoding as outlined in getPath().
*
* @param string $path The path to use with the new instance.
* @return static A new instance with the specified path.
* @throws \InvalidArgumentException for invalid paths.
*/
public function withPath($path);
/**
* Return an instance with the specified query string.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified query string.
*
* Users can provide both encoded and decoded query characters.
* Implementations ensure the correct encoding as outlined in getQuery().
*
* An empty query string value is equivalent to removing the query string.
*
* @param string $query The query string to use with the new instance.
* @return static A new instance with the specified query string.
* @throws \InvalidArgumentException for invalid query strings.
*/
public function withQuery($query);
/**
* Return an instance with the specified URI fragment.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the specified URI fragment.
*
* Users can provide both encoded and decoded fragment characters.
* Implementations ensure the correct encoding as outlined in getFragment().
*
* An empty fragment value is equivalent to removing the fragment.
*
* @param string $fragment The fragment to use with the new instance.
* @return static A new instance with the specified fragment.
*/
public function withFragment($fragment);
/**
* Return the string representation as a URI reference.
*
* Depending on which components of the URI are present, the resulting
* string is either a full URI or relative reference according to RFC 3986,
* Section 4.1. The method concatenates the various components of the URI,
* using the appropriate delimiters:
*
* - If a scheme is present, it MUST be suffixed by ":".
* - If an authority is present, it MUST be prefixed by "//".
* - The path can be concatenated without delimiters. But there are two
* cases where the path has to be adjusted to make the URI reference
* valid as PHP does not allow to throw an exception in __toString():
* - If the path is rootless and an authority is present, the path MUST
* be prefixed by "/".
* - If the path is starting with more than one "/" and no authority is
* present, the starting slashes MUST be reduced to one.
* - If a query is present, it MUST be prefixed by "?".
* - If a fragment is present, it MUST be prefixed by "#".
*
* @see http://tools.ietf.org/html/rfc3986#section-4.1
* @return string
*/
public function __toString();
}
<?php
namespace Psr\Http\Message;
/**
* Value object representing a file uploaded through an HTTP request.
*
* Instances of this interface are considered immutable; all methods that
* might change state MUST be implemented such that they retain the internal
* state of the current instance and return an instance that contains the
* changed state.
*/
interface UploadedFileInterface
{
/**
* Retrieve a stream representing the uploaded file.
*
* This method MUST return a StreamInterface instance, representing the
* uploaded file. The purpose of this method is to allow utilizing native PHP
* stream functionality to manipulate the file upload, such as
* stream_copy_to_stream() (though the result will need to be decorated in a
* native PHP stream wrapper to work with such functions).
*
* If the moveTo() method has been called previously, this method MUST raise
* an exception.
*
* @return StreamInterface Stream representation of the uploaded file.
* @throws \RuntimeException in cases when no stream is available.
* @throws \RuntimeException in cases when no stream can be created.
*/
public function getStream();
/**
* Move the uploaded file to a new location.
*
* Use this method as an alternative to move_uploaded_file(). This method is
* guaranteed to work in both SAPI and non-SAPI environments.
* Implementations must determine which environment they are in, and use the
* appropriate method (move_uploaded_file(), rename(), or a stream
* operation) to perform the operation.
*
* $targetPath may be an absolute path, or a relative path. If it is a
* relative path, resolution should be the same as used by PHP's rename()
* function.
*
* The original file or stream MUST be removed on completion.
*
* If this method is called more than once, any subsequent calls MUST raise
* an exception.
*
* When used in an SAPI environment where $_FILES is populated, when writing
* files via moveTo(), is_uploaded_file() and move_uploaded_file() SHOULD be
* used to ensure permissions and upload status are verified correctly.
*
* If you wish to move to a stream, use getStream(), as SAPI operations
* cannot guarantee writing to stream destinations.
*
* @see http://php.net/is_uploaded_file
* @see http://php.net/move_uploaded_file
* @param string $targetPath Path to which to move the uploaded file.
* @throws \InvalidArgumentException if the $targetPath specified is invalid.
* @throws \RuntimeException on any error during the move operation.
* @throws \RuntimeException on the second or subsequent call to the method.
*/
public function moveTo($targetPath);
/**
* Retrieve the file size.
*
* Implementations SHOULD return the value stored in the "size" key of
* the file in the $_FILES array if available, as PHP calculates this based
* on the actual size transmitted.
*
* @return int|null The file size in bytes or null if unknown.
*/
public function getSize();
/**
* Retrieve the error associated with the uploaded file.
*
* The return value MUST be one of PHP's UPLOAD_ERR_XXX constants.
*
* If the file was uploaded successfully, this method MUST return
* UPLOAD_ERR_OK.
*
* Implementations SHOULD return the value stored in the "error" key of
* the file in the $_FILES array.
*
* @see http://php.net/manual/en/features.file-upload.errors.php
* @return int One of PHP's UPLOAD_ERR_XXX constants.
*/
public function getError();
/**
* Retrieve the filename sent by the client.
*
* Do not trust the value returned by this method. A client could send
* a malicious filename with the intention to corrupt or hack your
* application.
*
* Implementations SHOULD return the value stored in the "name" key of
* the file in the $_FILES array.
*
* @return string|null The filename sent by the client or null if none
* was provided.
*/
public function getClientFilename();
/**
* Retrieve the media type sent by the client.
*
* Do not trust the value returned by this method. A client could send
* a malicious media type with the intention to corrupt or hack your
* application.
*
* Implementations SHOULD return the value stored in the "type" key of
* the file in the $_FILES array.
*
* @return string|null The media type sent by the client or null if none
* was provided.
*/
public function getClientMediaType();
}