500 Internal server error - Empty response header name ...

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500 Internal server error - Empty response header name ...

Postby projecto » Wed Aug 09, 2017 3:21 pm

I have been using qdpm v9.0 (from qdpm/core/apps/qdPM/config/app.yml) on Centos 6.7 server with PHP 7.0.6 and apache 2.2.x and MariaDB 5.5.x for over a year now without any issues.

Today I tried to install Let's Encrypt SSL certificates and this upgraded Apache/httpd to 2.2.15, no change in PHP or MySQL versions.

Also, this is not a misconfiguration of SSL or Apache because other apps on other domains work fine, with or without Let's Encrypt SSL certificates.

Upon restarting httpd after SSL certificate installation, suddenly I get 500 Internal Server Errors and the Apache error log shows:
[Wed Aug 09 14:55:22 2017] [error] [client x.x.x.x] Empty response header name, aborting request
[Wed Aug 09 14:55:32 2017] [error] [client x.x.x.x] Empty response header name, aborting request

Google does not help except some German discussion suggests to use PHP 5.3:
https://www.php.de/forum/webentwicklung ... -framework

I cleared the cache several times.

I removed all Let's Encrypt SSL configuration as well as restored old self signed SSL certificates and restored Apache configuration to earlier working state.

And because we take backups daily, I even restored the entire code backup from a few hours before.

I still get the same error and no clue / hint as to how to debug it.

So can someone tell me :
1. how to fix this

If not, then,
2. How to enable debugging so I could find where "empty header name" is being created so that maybe I can patch it?

3. Can I run it as http://qdpm instead of https://qdpm, so that I can rule out any SSL related issue (I doubt this is the case, though)?

4. Do I *have* to move back from PHP 7.x down to PHP 5.x and if yes, will 5.6.x do?

5. Is there a way to upgrade Symfony/qdPM and keep all the data in qdPM?

Thanks in advance.
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Joined: Wed Aug 09, 2017 2:48 pm

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