tree bee21bc0c3d4f0d6aecab432f8c1e9c2135edd05
parent b1a039161764bd0fbc4cd7f7a9d333ce41d75a25
author Patryk Lesiewicz <patryk@google.com> 1512172754 -0800
committer Patryk Lesiewicz <patryk@google.com> 1512172754 -0800

Upstream: flush low-level buffers on write retry.

If the data to write is bigger than what the socket can send, and the
reminder is smaller than NGX_SSL_BUFSIZE, then SSL_write() fails with
SSL_ERROR_WANT_WRITE. The reminder of payload however is successfully
copied to the low-level buffer and all the output chain buffers are
flushed. This means that retry logic doesn't work because
ngx_http_upstream_process_non_buffered_request() checks only if there's
anything in the output chain buffers and ignores the fact that something
may be buffered in low-level parts of the stack.

Signed-off-by: Patryk Lesiewicz <patryk@google.com>