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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 to 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.

Abstract Interface
Methods
public abstract getAttribute ( $name , $default = NULL )
 

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()
  • return mixed
public abstract getAttributes ()
 

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 array Attributes derived from the request.
public abstract Psr\Http\Message\MessageInterface :: getBody ()
 

Gets the body of the message.

public abstract getCookieParams ()
 

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 abstract Psr\Http\Message\MessageInterface :: getHeader ( $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.

  • 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 abstract Psr\Http\Message\MessageInterface :: getHeaderLine ( $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.

  • 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 abstract Psr\Http\Message\MessageInterface :: getHeaders ()
 

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 abstract Psr\Http\Message\RequestInterface :: getMethod ()
 

Retrieves the HTTP method of the request.

  • return string Returns the request method.
public abstract getParsedBody ()
 

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 abstract Psr\Http\Message\MessageInterface :: getProtocolVersion ()
 

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 abstract getQueryParams ()
 

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 abstract Psr\Http\Message\RequestInterface :: getRequestTarget ()
 

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 abstract getServerParams ()
 

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 abstract getUploadedFiles ()
 

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 abstract Psr\Http\Message\RequestInterface :: getUri ()
 

Retrieves the URI instance.

This method MUST return a UriInterface instance.

public abstract Psr\Http\Message\MessageInterface :: hasHeader ( $name )
 

Checks if a header exists by the given case-insensitive 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 abstract Psr\Http\Message\MessageInterface :: withAddedHeader ( $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.

  • return static
  • throws InvalidArgumentException for invalid header names or values.
public abstract withAttribute ( $name , $value )
 

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()
  • return static
public abstract Psr\Http\Message\MessageInterface :: withBody ( Psr\Http\Message\StreamInterface $body )
 

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.

  • return static
  • throws InvalidArgumentException When the body is not valid.
public abstract withCookieParams ( array $cookies )
 

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.

  • return static
public abstract Psr\Http\Message\MessageInterface :: withHeader ( $name , $value )
 

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.

  • return static
  • throws InvalidArgumentException for invalid header names or values.
public abstract Psr\Http\Message\RequestInterface :: withMethod ( $method )
 

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.

  • return static
  • throws InvalidArgumentException for invalid HTTP methods.
public abstract withoutAttribute ( $name )
 

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()
  • return static
public abstract Psr\Http\Message\MessageInterface :: withoutHeader ( $name )
 

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.

  • return static
public abstract withParsedBody ( $data )
 

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.

  • return static
  • throws InvalidArgumentException if an unsupported argument type is provided.
public abstract Psr\Http\Message\MessageInterface :: withProtocolVersion ( $version )
 

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.

  • return static
public abstract withQueryParams ( array $query )
 

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.

  • return static
public abstract Psr\Http\Message\RequestInterface :: withRequestTarget ( $requestTarget )
 

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.

public abstract withUploadedFiles ( array $uploadedFiles )
 

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.

  • return static
  • throws InvalidArgumentException if an invalid structure is provided.
public abstract Psr\Http\Message\RequestInterface :: withUri ( Psr\Http\Message\UriInterface $uri , $preserveHost = false )
 

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.

© 2020 Bruce Wells
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