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.

AbstractInterface
Methods
public abstract getBody()
 

Gets the body of the message.

public abstract 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 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 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 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 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 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 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 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 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 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
© 2020 Bruce Wells
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