Ngx_http_wait_request_handler function parsing

In the normal HTTP request process, the Ngx_event_accept function is Ls->handler (c); The Ngx_http_init_connection function is called, Ngx_http_init_ The connection function calls Ngx_http_wait_request_handler. The main code and parsing are as follows.     See if the event has expired, and if it has expired, disconnect if  directly (rev->timedout)  {    ngx_log_error (ngx_log_info, c->log, ngx_etimedout,  "Client timed out");     Ngx_http_close_connection (c);     return;} Call the RECV function to receive the data. function prototypes are defined in NGX_RECV.C, and there are two function definitions depending on whether kqueue (an I/O multiplexing technique) is used. N = C->RECV (c, b->last, size);if  (n == ngx_again)  {      There is no data channel, due to nginx event-driven mechanism, the program will not block, register read events and return.     if  (Ngx_handle_read_event (rev, 0)  != NGX_OK)       {        ngx_http_close_connection (c);         return;    }     connection There may be no substantive work done, so release memory for the moment.     if  (Ngx_pfree (C->pool, b->start)  == NGX_OK)      {         b->start = NULL;    }     return;} The RECV function returned an error, disconnected directly and returned. if  (N == ngx_error)  {    ngx_http_close_connection (c);     return;} The client has actively disconnected the connection. if  (n == 0)  {    ngx_log_error (ngx_log_info, c->log, 0,                    " Client closed connection ");     ngx_http_close_connection (c);     return;} If there is something similar to "listen 80 proxy_protocol;" Configuration, has not been carefully studied if  (Hc->proxy_protocol)  {        ...     }ngx_reusable_connection (c, 0); invokes the Ngx_http_create_request function to initialize a ngx_http_request_t struct. C-&gT;data = ngx_http_create_request (c);if  (C->data == null)  {     ngx_http_close_connection (c);     return;} Sets the Read event callback function for the destination connection to process the processing request line rev->handler = ngx_http_process_request_line; first executes the processing request line function, in ngx_http_process _request_line in Ngx_http_process_request_line (rev.);

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Ngx_http_wait_request_handler function parsing