Package akka.http.impl.engine.http2

Class Http2Protocol

  • public class Http2Protocol
extends java.lang.Object
    INTERNAL API

    Defines constants as defined in the HTTP/2 specification.

    https://tools.ietf.org/html/rfc7540

    • Constructor Detail

      • Http2Protocol

        public Http2Protocol()

    • Method Detail

      • InitialMaxConcurrentStreams

        public static final int InitialMaxConcurrentStreams()
        Indicates the maximum number of concurrent streams that the sender will allow. This limit is directional: it applies to the number of streams that the sender permits the receiver to create. Initially, there is no limit to this value. It is recommended that this value be no smaller than 100, so as to not unnecessarily limit parallelism.

        A value of 0 for SETTINGS_MAX_CONCURRENT_STREAMS SHOULD NOT be treated as special by endpoints. A zero value does prevent the creation of new streams; however, this can also happen for any limit that is exhausted with active streams. Servers SHOULD only set a zero value for short durations; if a server does not wish to accept requests, closing the connection is more appropriate.

        Returns:
        (undocumented)

      • InitialWindowSize

        public static final int InitialWindowSize()
        The initial window size for both new streams and the overall connection as defined by the specification.

        See https://tools.ietf.org/html/rfc7540#section-5.2.1: 4. The initial value for the flow-control window is 65,535 octets for both new streams and the overall connection.

        Returns:
        (undocumented)

      • InitialMaxFrameSize

        public static final int InitialMaxFrameSize()
        The initial frame size for both incoming and outgoing frames as defined by the specification.

        The frame size can be changed by changing SETTINGS_MAX_FRAME_SIZE.

        See https://tools.ietf.org/html/rfc7540#section-6.5.2:

        SETTINGS_MAX_FRAME_SIZE (0x5): Indicates the size of the largest frame payload that the sender is willing to receive, in octets.

        The initial value is 2^14 (16,384) octets. The value advertised by an endpoint MUST be between this initial value and the maximum allowed frame size (2^24-1 or 16,777,215 octets), inclusive. Values outside this range MUST be treated as a connection error (Section 5.4.1) of type PROTOCOL_ERROR.

        Returns:
        (undocumented)

      • MinFrameSize

        public static final int MinFrameSize()
        Minimum frame size that can be written.

        See http://httpwg.org/specs/rfc7540.html#rfc.section.4.2

        The size of a frame payload is limited by the maximum size that a receiver advertises in the SETTINGS_MAX_FRAME_SIZE setting. This setting can have any value between 2^14^ (16,384) and 2^24^-1 (16,777,215) octets, inclusive.

        Returns:
        (undocumented)

      • MaxFrameSize

        public static final int MaxFrameSize()
        Maximum frame size that can be written.

        See http://httpwg.org/specs/rfc7540.html#rfc.section.4.2

        The size of a frame payload is limited by the maximum size that a receiver advertises in the SETTINGS_MAX_FRAME_SIZE setting. This setting can have any value between 2^14^ (16,384) and 2^24^-1 (16,777,215) octets, inclusive.

        Returns:
        (undocumented)

      • InitialMaxHeaderTableSize

        public static final int InitialMaxHeaderTableSize()
        Initial maximum size of the header compression table used to decode header blocks, in octets.

        See http://httpwg.org/specs/rfc7540.html#SettingValues

        Returns:
        (undocumented)

      • InitialMaxHeaderListSize

        public static final int InitialMaxHeaderListSize()
        This advisory setting informs a peer of the maximum size of header list that the sender is prepared to accept, in octets.

        The value is based on the uncompressed size of header fields, including the length of the name and value in octets plus an overhead of 32 octets for each header field. For any given request, a lower limit than what is advertised MAY be enforced.

        See http://httpwg.org/specs/rfc7540.html#SettingValues

        Returns:
        (undocumented)

      • NoStreamId

        public static final int NoStreamId()
        The stream id to be used for frames not associated with any individual stream as defined by the specification.

        See https://tools.ietf.org/html/rfc7540#section-4.1:

        Stream Identifier: A stream identifier (see Section 5.1.1) expressed as an unsigned 31-bit integer. The value 0x0 is reserved for frames that are associated with the connection as a whole as opposed to an individual stream.

        Returns:
        (undocumented)

      • PushPromiseEnabledDefault

        public static final boolean PushPromiseEnabledDefault()

      • ClientConnectionPreface

        public static akka.util.ByteString ClientConnectionPreface()
        The client connection preface starts with a sequence of 24 octets, which in hex notation is:

        0x505249202a20485454502f322e300d0a0d0a534d0d0a0d0a

        That is, the connection preface starts with the string "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n".

        Returns:
        (undocumented)