MessageInterface

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.

Known implementers

Psr\Http\Message\RequestInterface , Psr\Http\Message\ResponseInterface , Psr\Http\Message\ServerRequestInterface

http://www.ietf.org/rfc/rfc7230.txt
http://www.ietf.org/rfc/rfc7231.txt
Open source code

Methods Summary
`public`	# `getProtocolVersion( )` Retrieves the HTTP protocol version as a string. The string MUST contain only the HTTP version number (e.g., "1.1", "1.0").
`public`	# `withProtocolVersion( string $version )` Return an instance with the specified HTTP protocol version. The version string MUST contain only the HTTP version number (e.g., "1.1", "1.0"). This method MUST be implemented in such a way as to retain the immutability of the message, and MUST return an instance that has the new protocol version.
`public`	# `getHeaders( )` Retrieves all message header values. The keys represent the header name as it will be sent over the wire, and each value is an array of strings associated with the header. // Represent the headers as a string foreach ($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.
`public`	# `hasHeader( string $name )` Checks if a header exists by the given case-insensitive name.
`public`	# `getHeader( string $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.
`public`	# `getHeaderLine( string $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.
`public`	# `withHeader( string $name , string\|string[] $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.
`public`	# `withAddedHeader( string $name , string\|string[] $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.
`public`	# `withoutHeader( string $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.
`public`	# `getBody( )` Gets the body of the message.
`public`	# `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.