our server on certain POST requests is returning a blank page with status code 200.
There is no PHP error. Problem reamains even if I manualy clear $_POST array.
How you got any ideas?
Configutation:
nginx
symfony 2.3.20
PHP 5.4.33-1~dotdeb.1
W also have varnish but problem remains after varnish shutdown.
Error reporting in on with option E_ALL
Well, in symfony2 it's easy to return like:
return new Response(null, 200);
wich does exactly what you say it does. Are you sure you are returning content from symfony2?
Which version of symfony you are using? The scenario looks more like a php error caused by mismatched function parameter or non existent function call.
-Run your application with debug enabled in your app_dev.php.
- add E_RECOVERABLE_ERROR in ErrorHandler.php handleFatal() funtion where error type is checked. Generally a mismatched function parameter throws a php error of type E_RECOVERABLE_ERROR and is not handled properly on symfony.
Once this is done run your page again. Hopefully the error will throw up on your page.
Hope this helps
Answering to my own question.
Indeed it was a PHP error - memory limit exhousted. It turned out when I binded to php cgi process via strace. Nginx did not return 500 status code. It did not even view fatal errors and log them (despite error_reporting = On with E_ALL).
I don`t know why. I will ask another question about that.
Related
I am having an issue when I have a php application that is returning an internal server error (500) however nothing is showing up in the error log.
Now I know there are error with what I am trying to run, I know I have missing some files and what not but something should show in the apache error log (otherwise how are I supposed to know exactly what I am missing).
I created a test script is errors it in under the same vhost configuration and those error show up fine so everything seems configured right as far as php/apache. Are there certain php errors that does show up in the error log (php is configure to display any type of notice, warning, , error, fatal error, etc...)?
This is running on ubunut 10.04 with the standard apache and php from the ubuntu repo with apt-get.
Scan your source files to find #.
From php documentation site
Currently the "#" error-control operator prefix will even disable
error reporting for critical errors that will terminate script
execution. Among other things, this means that if you use "#" to
suppress errors from a certain function and either it isn't available
or has been mistyped, the script will die right there with no
indication as to why.
Copy and paste the following into a new .htaccess file and place it on your website's root folder :
php_flag display_errors on
php_flag display_startup_errors on
Errors will be shown directly in your page.
That's the best way to debug quickly but don't use it for long time because it could be a security breach.
If you still have 500 error and no logs you can try to execute from command line:
php -f file.php
it will not work exactly like in a browser (from server) but if there is syntax error in your code, you will see error message in console.
Maybe something turns off error output. (I understand that you are trying to say that other scripts properly output their errors to the errorlog?)
You could start debugging the script by determining where it exits the script (start by adding a echo 1; exit; to the first line of the script and checking whether the browser outputs 1 and then move that line down).
In the past, I had no error logs in two cases:
The user under which Apache was running had no permissions to modify php_error_log file.
Error 500 occurred because of bad configuration of .htaccess, for example wrong rewrite module settings. In this situation errors are logged to Apache error_log file.
For Symfony projects, be sure to check files in the project'es app/logs
More details available on this post :
How to debug 500 Error in Symfony 2
Btw, other frameworks or CMS share this kind of behaviour.
Here is another reason why errors might not be visible:
I had the same issue. In my case, I had copied the source from a production environment. Hence the ENVIRONMENT variable defined in index.php was set to 'production'. This caused error_reporting to be set to 0 (no logging). Just set it to 'development' and you should start seeing error messages in apache log.
Turned out the 500 was due to a semi colon missing in database config :-)
Another case which happened to me, is I did a CURL to some of my pages, and got internal server error and nothing was in the apache logs, even when I enabled all error reporting.
My problem was that in the CURL I set
curl_setopt($CR, CURLOPT_FAILONERROR, true);
Which then didn't show me my error, though there was one, this happened because the error was on a framework level and not a PHP one, so it didn't appear in the logs.
You need to enable the PHP error log.
This is due to some random glitch in the web server when you have a php error, it throws a 500 internal error (i have the same issue).
If you look in the PHP error log, you should find your solution.
see here in the doc of how to enable it in the php.ini
Be sure your file permissions are correct. If apache doesn't have permission to read the file then it can't write to the log.
What happened for me when this was an issue, was that the site had used too much memory, so I'm guessing that it couldn't write to an error log or displayed the error. For clarity, it was a Wordpress site that did this. Upping the memory limit on the server showed the site again.
SOLVED
I struggled with this and later on, I realized that I was working on PHP 5.6, so I upgraded to PHP 7.0, then I released there were comments placed by git for conflicting codes. I found something like this in my code <<<<<<<< But solved it.
I am having an issue when I have a php application that is returning an internal server error (500) however nothing is showing up in the error log.
Now I know there are error with what I am trying to run, I know I have missing some files and what not but something should show in the apache error log (otherwise how are I supposed to know exactly what I am missing).
I created a test script is errors it in under the same vhost configuration and those error show up fine so everything seems configured right as far as php/apache. Are there certain php errors that does show up in the error log (php is configure to display any type of notice, warning, , error, fatal error, etc...)?
This is running on ubunut 10.04 with the standard apache and php from the ubuntu repo with apt-get.
Scan your source files to find #.
From php documentation site
Currently the "#" error-control operator prefix will even disable
error reporting for critical errors that will terminate script
execution. Among other things, this means that if you use "#" to
suppress errors from a certain function and either it isn't available
or has been mistyped, the script will die right there with no
indication as to why.
Copy and paste the following into a new .htaccess file and place it on your website's root folder :
php_flag display_errors on
php_flag display_startup_errors on
Errors will be shown directly in your page.
That's the best way to debug quickly but don't use it for long time because it could be a security breach.
If you still have 500 error and no logs you can try to execute from command line:
php -f file.php
it will not work exactly like in a browser (from server) but if there is syntax error in your code, you will see error message in console.
Maybe something turns off error output. (I understand that you are trying to say that other scripts properly output their errors to the errorlog?)
You could start debugging the script by determining where it exits the script (start by adding a echo 1; exit; to the first line of the script and checking whether the browser outputs 1 and then move that line down).
In the past, I had no error logs in two cases:
The user under which Apache was running had no permissions to modify php_error_log file.
Error 500 occurred because of bad configuration of .htaccess, for example wrong rewrite module settings. In this situation errors are logged to Apache error_log file.
For Symfony projects, be sure to check files in the project'es app/logs
More details available on this post :
How to debug 500 Error in Symfony 2
Btw, other frameworks or CMS share this kind of behaviour.
Here is another reason why errors might not be visible:
I had the same issue. In my case, I had copied the source from a production environment. Hence the ENVIRONMENT variable defined in index.php was set to 'production'. This caused error_reporting to be set to 0 (no logging). Just set it to 'development' and you should start seeing error messages in apache log.
Turned out the 500 was due to a semi colon missing in database config :-)
Another case which happened to me, is I did a CURL to some of my pages, and got internal server error and nothing was in the apache logs, even when I enabled all error reporting.
My problem was that in the CURL I set
curl_setopt($CR, CURLOPT_FAILONERROR, true);
Which then didn't show me my error, though there was one, this happened because the error was on a framework level and not a PHP one, so it didn't appear in the logs.
You need to enable the PHP error log.
This is due to some random glitch in the web server when you have a php error, it throws a 500 internal error (i have the same issue).
If you look in the PHP error log, you should find your solution.
see here in the doc of how to enable it in the php.ini
Be sure your file permissions are correct. If apache doesn't have permission to read the file then it can't write to the log.
What happened for me when this was an issue, was that the site had used too much memory, so I'm guessing that it couldn't write to an error log or displayed the error. For clarity, it was a Wordpress site that did this. Upping the memory limit on the server showed the site again.
SOLVED
I struggled with this and later on, I realized that I was working on PHP 5.6, so I upgraded to PHP 7.0, then I released there were comments placed by git for conflicting codes. I found something like this in my code <<<<<<<< But solved it.
My server is setup with Nginx + PHP + FastCGI. Whenever PHP throws a Fatal error, it gets logged inside of nginx/error.log, but the server reports HTTP Error 500 back to the browser instead of displaying the PHP Fatal error to the browser as is desired and typical in other setups. I've been searching for how to resolve this and keep coming up short. Anyone have anything helpful about this? Much appreciated!
Found it!
As of PHP 5.2.4, the default is now to cause a 500 error, because the alternative is an empty page.
Other discussions suggest that this behavior can not be changed for the "PHP Fatal" error type, which don't flow through the normal error handler routines and can not be caught or stopped.
You probably have php_errors off (or the displaying of them) in your php loader script... Try checking your php.ini settings...
I'm working on a large (inherited) codebase in PHP, and the error Exception thrown without a stack frame in Unknown on line 0 has started showing up at the bottom of every page. I understand what the error means: an exception is getting thrown someplace it can't be thrown. I've even managed to track it down somewhat—it's happening during the time shutdown functions are being called.
I've put logging in all the functions which get registered with register_shutdown_function, and it's not happening in any of those. Unfortunately, I can't seem to get any more information than that; I know what the last shutdown function to get called successfully is, but I have no idea what code gets executed between that and the point where the error happens. I don't even know what part of the PHP machinery is calling that last shutdown function. It might be something with the logging framework, or the session framework, or anything of a half-dozen things.
Does anyone know how to pinpoint where the error is occurring?
This can happen in destructors and exception handlers which don't have a stack frame. But since the message is so very helpful, your only option is to try to use echo to find the bug (and maybe ob_end_flush()). It may be that a destructor is throwing an exception, or is calling a function that throws an exception. Once you've located the buggy function, add a try...catch around the exception throwing part.
Note that if your framework uses its own error handling, you have to turn off warnings and notices in the PHP configuration. Especially if you have something like ErrorException, since it turns warnings into exceptions.
This message appears when an exception in thrown within your exception handler or your error handler (and maybe also in shutdown functions)
You should look for theses methods see if nothing strange appens in here.
Just found your question after experiencing the same error in a web application deployed to a Ubuntu 11.04 server, running PHP 5.3.5. I agree to #Eisberg that this issue seems to be an issue with the PHP 5.3-version exclusively, as the error haven't been present with previous, other PHP versions on other environments, where my application have been deployed to.
As #jmz mentions, I have also utilized an error handler that turns errors into exceptions for easier debugging at my staging servers.
To figure out what caused this mysterious behaviour, I debugged the application using XDEBUG & my IDE (Eclipse) and found out that one of my libraries tried to access & modify the global$_SESSION variable, when no session-data were set. Wrapping my code in an if-statement checking isset($_SESSION) made the issue disappear.
Why the exception didn't bubble up completely all the way to the browser, as other errors have done when trying to access non-set variables, is a complete mystery for me, especially as I got below error settings set, but maybe altering the setting in error_reporting() would have made a difference.
Error handling settings, for reference:
error_reporting(E_ALL | E_STRICT);
ini_set("display_errors", 1);
ini_set("html_errors", 1);
I get the same error msg too. MySQL database quota was set by awardspace as 50mb. Using PHPmyAdmin to optimise files showed a size of 34 mb but at cPanel the size was shown as 57mb. Every time when I visit my website and this error msg occurred, all I need to do was to login into awardspace, choose database, management, and reset file permissions. Then the error msg goes away, and my website is back up.
I was getting this issue in PHPUnit. I have added below code in function tearDown and helps me to get the actual error. You should wrap destructor inside a try-catch block, as the stack-frame only gets lost as soon as the exception is getting outside the destructor. Might be this can help someone else too. Source
function __destruct()
{
try
{
/*
your code
*/
}
catch(Exception $e)
{
echo $e->__toString();
}
}
I was wondering if anybody knew of a method to configure apache to fall back to returning a static HTML page, should it (Apache) be able to determine that PHP has died? This would provide the developer with a elegant solution to displaying an error page and not (worst case scenario) the source code of the PHP page that should have been executed.
Thanks.
The PHP source code is only displayed when apache is not configured correctly to handle php files. That is, when a proper handler has not been defined.
On errors, what is shown can be configured on php.ini, mainly the display_errors variable. That should be set to off and log_errors to on on a production environment.
If php actually dies, apache will return the appropriate HTTP status code (usually 500) with the page defined by the ErrorDocument directive. If it didn't die, but got stuck in a loop, there is not much you can do as far as I know.
You can specify a different page for different error codes.
I would assume that this typically results in a 500 error, and you can configure apaches 500 handler to show a static page:
ErrorDocument 500 /500error.html
You can also read about error handlers on apaches documentation site
The real problem is that PHP fatal errors don't cause Apache to return a 500 code. Errors except for E_FATAL and E_PARSE can be handled however you like using set_error_handler().
There are 2 ways to use PHP and Apache.
1. Install PHP as an Apache module: this way the PHP execution is a thread inside the apache process. So if PHP execution fails, then Apache process fails too. there is no fallback strategy.
2. Install PHP as a CGI script handler: this way Apache will start a new PHP process for each request. If the PHP execution fails, then Apache will know that, and there might be a way to handle the error.
regardless of the way you install PHP, when PHP execution fails you can handle errors in the php.ini file.