Bug #67884 [Opn->Nab]: Doing a request to itself causes a lock

Edit report at https://bugs.php.net/bug.php?id=67884&edit=1 ID: 67884 Updated by: johannes@php.net Reported by: jgmdev@php.net Summary: Doing a request to itself causes a lock -Status: Open +Status: Not a bug Type: Bug Package: Built-in web server Operating System: Linux (Archlinux) PHP Version: 5.5.15 Block user comment: N Private report: N New Comment: The embedded web server is for testing purpose and not meant as a full web server. This limitation along with others (like missing vhost support etc.) is by design and we don't have any plans to change that as there are multiple good web servers already which work nicely with PHP. Previous Comments: ------------------------------------------------------------------------ [2014-08-22 18:59:14] jgmdev@php.net I see :(, looking at the code polling was used, well I'm not going to be able to test my system using the built-in server. Something like http://en.wikipedia.org/wiki/Multiple_asynchronous_periodic_polling would solve the issue, wonder how much work it would be to implement that. ------------------------------------------------------------------------ [2014-08-22 18:45:12] requinix@php.net With a sleep(1) in the router script I get Concurrency Level: 100 Time taken for tests: 1000.604 seconds Complete requests: 1000 Failed requests: 0 Total transferred: 121000 bytes HTML transferred: 0 bytes Requests per second: 1.00 [#/sec] (mean) Time per request: 100060.414 [ms] (mean) Time per request: 1000.604 [ms] (mean, across all concurrent requests) Transfer rate: 0.12 [Kbytes/sec] received Given X=number of concurrent requests served by PHP, and a sleep(1) to account for the various "per second"-s, the report will say: - Time taken: 1000 [total time] / X - Requests per second: X - Mean time per request: 100 [concurrent requests by AB] * 1000 [msec. each] / X So it's not concurrent. Besides, I don't see any threading or forking going on in the source code. ------------------------------------------------------------------------ [2014-08-22 13:10:34] jgmdev@php.net I tested with ab -c 100 -n 1000 http://localhost:8001/ and a router file that doesn't request it self: <?php print "something"; And here are the results, which shows that the built-in server does supports concurrency/threading (unless it is happening so fast that feels like threading): Concurrency Level: 100 Time taken for tests: 0.075 seconds Complete requests: 1000 Failed requests: 0 Total transferred: 118000 bytes HTML transferred: 7000 bytes Requests per second: 13335.82 [#/sec] (mean) Time per request: 7.499 [ms] (mean) Time per request: 0.075 [ms] (mean, across all concurrent requests) Transfer rate: 1536.75 [Kbytes/sec] received Also the meaning of "PHP applications will stall if a request is blocked" isn't clear. ------------------------------------------------------------------------ [2014-08-22 04:17:37] requinix@php.net Isn't the server single-threaded? The docs say right there at the top "PHP applications will stall if a request is blocked". ------------------------------------------------------------------------ [2014-08-22 03:28:22] jgmdev@php.net Description: ------------ The built-in testing webserver locks down if current executing script makes a request using file_get_contents, get_headers, as any function which supports the http:// streams that makes a request to itself. With the router test script provided try: php -S localhost:8001 router-test.php wget http://localhost:8001/something (works fine) wget http://localhost:8001/ (lock when requesting /something) Test script: --------------- <?php $path = ""; if(isset($_SERVER["PHP_SELF"])) { $path .= ltrim($_SERVER["PHP_SELF"], "/"); } if($path == "something") { print "something"; } else { print "nothing"; // Locks here print file_get_contents("http://localhost:8001/something"); } Expected result: ---------------- Request to http://localhost:8001/ should print nothingsomething Actual result: -------------- The php built-in webserver locks when trying to request http://localhost:8001/something. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67884&edit=1