Frame Size / 帧大小

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.

帧有效载荷的大小不能超过接收端通过 SETTINGS_MAX_FRAME_SIZE 所告知的值。该值可以取2^14 (16,384)和2^24-1 (16,777,215)之间的任何值，包括2^24-1 (16,777,215)。

All implementations MUST be capable of receiving and minimally processing frames up to 2^14 octets in length, plus the 9-octet frame header (Section 4.1). The size of the frame header is not included when describing frame sizes.

所有的实现都必须能接收，并且处理最小长度为2^14 字节、外加9字节帧首部( 4.1节 )的帧。当描述帧大小时，不包括帧首部的大小。

Note: Certain frame types, such as PING (Section 6.7), impose additional limits on the amount of payload data allowed.

注意：某些帧类型，如PING( 6.7节 )帧，对允许的有效载荷数据量强加了额外的限制。

An endpoint MUST send an error code of FRAME_SIZE_ERROR if a frame exceeds the size defined in SETTINGS_MAX_FRAME_SIZE, exceeds any limit defined for the frame type, or is too small to contain mandatory frame data. A frame size error in a frame that could alter the state of the entire connection MUST be treated as a connection error (Section 5.4.1); this includes any frame carrying a header block (Section 4.3) (that is, HEADERS, PUSH_PROMISE, and CONTINUATION), SETTINGS, and any frame with a stream identifier of 0.

如果一个帧超出了 SETTINGS_MAX_FRAME_SIZE 设置的大小，或者超出了任何为该帧类型设定的限制，或者帧太小而无法包含强制性的帧数据，端点必须发送一个 FRAME_SIZE_ERROR 错误码。必须将可以改变整个连接状态的帧大小错误处理为连接错误( 5.4.1节 )，这包括所有携带首部块( 4.3节 )的帧(即，HEADERS ，PUSH_PROMISE 和 CONTINUATION ) ，SETTINGS 帧，和所有流标识符为0的帧。

Endpoints are not obligated to use all available space in a frame. Responsiveness can be improved by using frames that are smaller than the permitted maximum size. Sending large frames can result in delays in sending time-sensitive frames (such as RST_STREAM, WINDOW_UPDATE, or PRIORITY), which, if blocked by the transmission of a large frame, could affect performance.

端点不必用掉帧的所有可用空间。如果帧大小小于允许的最大值，可以改善响应性能。发送大的帧会导致时间敏感的帧(如，RST_STREAM ，WINDOW_UPDATE ，或 PRIORITY )发送延迟，这些帧如果被大帧阻塞住了，会影响性能。