Apache HTTP keepalive application test and change

Keep-alive:timeout=5, max=100
Timeout: Expires in 5 seconds (corresponding to httpd.conf in the parameter is: keepalivetimeout), Max is up to 100 requests, Force disconnect
It's a new connection over the timeout time, and Max will automatically subtract 1 until it's 0, forcing it to break off. See the following four graphs, note the date value (the time difference is within 5 seconds)!

Apache Change Header's connection:keep-alive

Change the keepalive parameter to off to make the connection:keep-alive into connection:closed

The header's output becomes connection:close.

To modify the Apache configuration file, the general space does not have this permission

The application in practice

The above implementation phttp_get is similar to the "Stay Connected" concept in MySQL memcache, which generally applies only to Web servers in fastcgi mode.
For HTTP communication between the machines, it is very logical to discover the advantages of Phttp_get in the testing process.
The advantages of Phttp_get are also not obvious for the service with longer processing time.
In summary, the phttp_get applies to the FastCGI-mode Web application calling the remote HTTP service, and this HTTP server has a relatively short response time.

Five, the service side need to pay attention to the matter

1,http server must support http/1.1 protocol
The 2,php application must return the header of Content-length: a specific implementation see:

http://cn.php.net/manual/en/function.ob-get-length.php

You need to add in your code:

The code is as follows	Copy Code
Ob_start (); $size =ob_get_length (); Header ("Content-length: $size"); Ob_end_flush ();

Finally, attach the test code:

The code is as follows

Copy Code

<?php $url =http://10.69.2.206:8080/sms/ns2/save_msg.txt function Ohttp_get ($host, $port, $query,& $body) { $FP =pfsockopen ($host, $port, $errno, $ERRSTR, 1); if (! $fp) { Var_dump ($errno, $ERRSTR); return-1; } $out = "Get ${query} http/1.1rn"; $out. = "Host: ${host}rn"; $out. = "Connection:closern"; $out. = "RN"; Fwrite ($fp, $out); $line =trim (fgets ($fp)); $header. = $line; List ($proto, $rcode, $result) =explode ("", $line); $len =-1; while (($line =trim (fgets ($FP)))!= "") { $header. = $line; if (Strstr ($line, "content-length:")) { List ($CL, $len) =explode ("", $line); } if (Strstr ($line, "Connection:close")) { $close =true; } } if ($len < 0) { echo "Ohttp_get must cope with content-length header!n"; return-1; } $body =fread ($fp, $len); if ($close) Fclose ($FP); return $rcode; } function Phttp_get ($host, $port, $query,& $body) { $FP =pfsockopen ($host, $port, $errno, $ERRSTR, 1); if (! $fp) { Var_dump ($errno, $ERRSTR); return-1; } $out = "Get ${query} http/1.1rn"; $out. = "Host: ${host}rn"; $out. = "Connection:keep-alivern"; $out. = "RN"; Fwrite ($fp, $out); $line =trim (fgets ($fp)); $header. = $line; List ($proto, $rcode, $result) =explode ("", $line); $len =-1; while (($line =trim (fgets ($FP)))!= "") { $header. = $line; if (Strstr ($line, "content-length:")) { List ($CL, $len) =explode ("", $line); } if (Strstr ($line, "Connection:close")) { $close =true; } } if ($len < 0) { echo "Phttp_get must cope with content-length header!n"; return-1; } $body =fread ($fp, $len); if ($close) Fclose ($FP); return $rcode; } $time 1=microtime (TRUE); For ($i =0 $i <10000; $i + +) { $host = "10.69.2.206″; $port = 8080; $query = "/sms/ns2/save_msg.txt"; $body = ""; $r =ohttp_get ($host, $port, $query, $body); if ($r!= 200) { echo "Return code: $RN"; } } $time 2=microtime (TRUE); For ($i =0 $i <10000; $i + +) { $url = "Http://10.69.2.206:8080/sms/ns2/save_msg.txt"; $host = "10.69.2.206″; $port = 8080; $query = "/sms/ns2/save_msg.txt"; $body = ""; $r =phttp_get ($host, $port, $query, $body); if ($r!= 200) { echo "Return code: $RN"; } } $time 3=microtime (TRUE); for ($i =0; $i Array (' timeout ' => 1) ) ); $body =file_get_contents ($url, 0, $ctx); $r = 200; if ($r!= 200) { echo "Return code: $RN"; } } $time 4=microtime (TRUE); echo "Phttp_get:". ($time 3-$time 2). " n "; echo "Ohttp_get:". ($time 2-$time 1). " n "; echo "file_get_contents:". ($time 4-$time 3). " n "; ?