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keep-connection

From: Martin Hamilton <martin@mrrl.lut.ac.uk>
Date: Mon, 26 Jun 1995 23:29:07 +0100 (BST)
To: www-talk@w3.org
Message-Id: <Pine.SUN.3.91.950626231427.23348A-100000@gizmo.lut.ac.uk>
There was some talk (last year?) about an HTTP header which clients could
use to ask servers to keep the connection open ... 

  Pragma: keep-connection

Is anyone working on this sort of thing ?  i.e. HTTP connection
caching/re-use

To put my money where my mouth is, I've hacked rudimentary support for
"keep-connection" into NCSA httpd 1.4.2 - see below.  If I have my
thinking head on, the hacked-over server should be willing to keep the
connection open after serving up static documents.  The rationale is that
these should always have an HTTP "Content-length:" header

How about it ? :-)

Martin


*** http_mime.c.FCS	Mon Jun 26 20:39:22 1995
--- http_mime.c	Mon Jun 26 20:39:30 1995
***************
*** 58,63 ****
--- 58,65 ----
  extern char referer_ignore[MAX_STRING_LEN];
  char referer[HUGE_STRING_LEN];
  
+ extern int keep_connection;
+ 
  void hash_insert(struct mime_ext *me) {
      register int i = hash(me->ext[0]);
      register struct mime_ext *p, *q;
***************
*** 459,464 ****
--- 461,468 ----
      num_inh = 0;
      num_processed = 0;
  
+     keep_connection = 0;
+ 
      while(!(getline(w,MAX_STRING_LEN-1,fd,timeout))) {
          if(!w[0]) 
              return;
***************
*** 495,500 ****
--- 499,510 ----
          }
          if(!strcasecmp(w,"If-modified-since"))
              strcpy(ims,l);
+ 	if(!strcasecmp(w,"Pragma")) {
+ 	    if(!strcasecmp(l,"keep-connection")) {
+ 		keep_connection = 1;
+ 	    }
+ 	    continue;
+ 	}
  
          http2cgi(w);
          if(in_headers_env) {

*** httpd.c.FCS	Mon Jun 26 20:39:18 1995
--- httpd.c	Mon Jun 26 20:39:30 1995
***************
*** 42,47 ****
--- 42,48 ----
  int Child=0;
  int Alone=0;
  int csd = -1;
+ int keep_connection=0;
  
  #ifndef NO_PASS
  char donemsg[]="DONE";
***************
*** 296,302 ****
  		      rfc931((struct sockaddr_in *)sa_client,
  			     sa_server));
      
!     process_request(0,stdout);
      fflush(stdout);
      shutdown(csd,2);
      close(csd);
--- 297,303 ----
  		      rfc931((struct sockaddr_in *)sa_client,
  			     sa_server));
      
!     do { process_request(0,stdout); } while (keep_connection);
      fflush(stdout);
      shutdown(csd,2);
      close(csd);
***************
*** 374,380 ****
          } else
              remote_logname = NULL;
  	
! 	process_request(0,stdout);
  	fflush(stdout);
  	shutdown(csd,2);
  	close(csd);
--- 375,381 ----
          } else
              remote_logname = NULL;
  	
! 	do { process_request(0,stdout); } while (keep_connection);
  	fflush(stdout);
  	shutdown(csd,2);
  	close(csd);
***************
*** 661,669 ****
          group_id = getgid();
  
          port = get_portnum(fileno(stdout),stdout);
          if(do_rfc931)
              remote_logname = get_remote_logname(stdout);
!         process_request(0,stdout);
  	fflush(stdout);
      }
      close_logs();
--- 662,673 ----
          group_id = getgid();
  
          port = get_portnum(fileno(stdout),stdout);
+ 
          if(do_rfc931)
              remote_logname = get_remote_logname(stdout);
! 
!         do { process_request(0,stdout); } while (keep_connection);
! 
  	fflush(stdout);
      }
      close_logs();
Received on Monday, 26 June 1995 19:02:11 GMT

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