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An HTTP message can be either a request sent from a client to a server, or a response sent by the server back to the client. The parts that are common to both request messages and response messages (protocol version, headers, and message body) are implemented in the Opis\Http\Message abstract class.

The constructor of the Message class has the following signature:

public function __construct(
    ?\Opis\Stream\IStream $body = null, 
    array $headers = [], 
    string $protocolVersion = '1.1'
);

• $body - the message body. It must be an instance of a stream or null
• $headers - a list a zero or more headers. The key represents the header’s name and the value represents the actual header value. You can pass the header names in a cas insensitive manner, since they are all normalised internally.
• $protocolVersion - the protocol version number

Protocol version

The protocol version number can be obtained by using the getProtocolVersion method.

$version = $message->getProtocolVersion();

Message body

The message body is represented with the help of streams. You can get the message body by using the getBody method. If the message doesn’t have a body, null is returned.

$body = $message->getBody();

Headers

Getting the full list of headers is done by using the getHeaders method.

$headers = $message->getHeaders();

Checking if a particular header exists is done by using the hasHeader method.

if ($request->hasHeader('Content-Type')) {
    // do something
}

Reading the value of a header is also very easy: just pass the name of the header (case insensitive) to the getHeader method.

$value = $request->getHeader('Content-Type');

By default, if the header doesn’t exist, than null is returned. You can specify which value to be returned, by passing a second argument to the getHeader method.

$value = $request->getHeader('Content-Type', 'text/html');