Fix stalled SSL connection when sending large headers #105
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In addition to #103. If we send large enough headers, more than postpone_output (1460) but less than ssl_buffer(16k) it also will be buffered and ngx_http_send_header returns NGX_AGAIN. So we need to threat it as OK and send more data.
Not sure will it return r->connection->buffered as well in any case with NGX_AGAIN.