500 Error - Premature end of script headers: index.php During Checkout

[code-interactive]

I'm on 1.6.0.9 shared hosting on Hostgator. I've been getting long load times followed by a 500 error page. The host says it's Premature end of script headers: index.php but that doesn't really tell me anything. 

 

I've deleted the smarty cache, commented out "SetEnv HTTP_MOD_REWRITE On" in the .htaccess and changed my PHP version to all available and I still get the problem.

 

The real trouble is that once this happens, I can't access the site at all on that browser until I delete the cookies.

 

Any suggestions?

[Simonas Invertus]

500 error does not say anything about the problem.

I am not sure if you can get detailed log files on shared hosting, but the real problem is written to the log file. 

I think if you could find problem description in the log file, you could easily find a solution too.

[code-interactive]

Correct- here's the error from the log: [Wed Sep 02 15:31:24 2015] [error] [client x.x.x.x] Premature end of script headers: index.php, referer: x.com/store

 

That still doesn't tell me much. Thanks in advance for your suggestions!

[Simonas Invertus]

I do not know the answer.

The best I could find is http://www.liquidweb.com/kb/apache-error-premature-end-of-script-headers/

[code-interactive]

Thanks- anyone else?

 

The curious thing is that the site is fine when I delete the cookie for the site.

[code-interactive]

Ugh this is annoying. I think the 500 error is just timing out. There's an issue with the shipping module I'm using and for some reason it's causing Presta to break.

[tuk66]

You cannot fix it without debugging right on the server. The most important thing is to locate the problem - in a module, core PrestaShop code, some situations only. I already fixed similar problems, PM.

[code-interactive]

Yeah, it's really annoying because the error log on the server doesn't track all the errors and it's very inconsistent. After some thorough troubleshooting, I was able to resolve that this type of error could be any number of different errors. For me it was running a function on the cart in the UPS shipping module. I guess the server couldn't handle that code and timed out or something.

 

Here's what I did to resolve it: http://thestateofart.com/get-order-total-in-ups-shipping-module-for-prestashop/

 

But this probably won't help others with server errors. I recommend switching out code that has been changed from the approved modules until it works and narrowing down the troubleshooting that way.