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For instance, the last_buf flag is used in the http proxy module when creating HTTP/2 requests to indicate the output is closed. The flag is inherited in ngx_output_chain() to a destination buffer when reading the buffered request body. Then it is used in the proxy output filter to mark the last HTTP/2 DATA frame with END_STREAM. The problem happens when reusing the destination buffer, such as to re-read the buffered request body on next upstream, because this buffer may contain a dirty last_buf value, which breaks sending HTTP/2 request body in multiple output filter calls. The flush and last_in_chain flags are cleared for consistency. |
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