redirect loop on Nginx, MySQL, PHP (LEMP) Stack on Debian 7

[herrvigg]

Issue by brodock
Tuesday Mar 31, 2015 at 18:13 GMT
Originally opened as qTranslate-Team/qtranslate-x#110

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My client have a wordpress install on a machine bootstrapped following this tutorial: https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mysql-php-lemp-stack-on-debian-7

Your plugin works fine redirecting pages from /my-page to /pt/my-page, but if there is a query string (for example google analytics source tracking, or anything else), than it fails to redirect to a valid url:

accessing : http://example.com/pt/my-page/?something
redirects to: http://example.com/pt/my-page/?q=/my-page/?&something
which redirects again to: http://example.com/pt/my-page/?q=/my-page/&q=/my-page/?&something
and so on...

I believe the problem is in this line:
https://github.com/qTranslate-Team/qtranslate-x/blob/master/qtranslate_core.php#L75

REQUEST_URI does include the query_string, which will never make the comparison for the canonical url match, and will trigger redirection infinitely.

[herrvigg]

Comment by johnclause
Tuesday Mar 31, 2015 at 19:57 GMT

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REQUEST_URI does include query on all tests servers I tried. Are you sure it is not included on your server? Which version of -X do you use? Can you try the latest from the GitHub, which can be downloaded from page https://github.com/qTranslate-Team/qtranslate-x with "Download ZIP" button: https://github.com/qTranslate-Team/qtranslate-x/archive/master.zip?

Please, paste here $_SERVER vars at trouble from your server, if it indeed has REQUEST_URI without query string. That line will make it redirect on such a server, but that would not be the only problem then. We will need to put special 'if' in a few places then. Let us first understand what is going on.

[herrvigg]

Comment by brodock
Thursday Apr 02, 2015 at 16:46 GMT

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Hi @johnclause, I believe you miss understood me.

let's assume I'm accessing http://example.com/my-page/?something and my default language is portuguese (/pt):

The following line will result in $url_orig = http://example.com/my-page/?something

$url_orig = $url_info['scheme'].'://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

after that there is this line:

$url_lang = qtranxf_convertURL('',$lang)

which I believe is not outputing http://example.com/my-page/?something but either: http://example.com/pt/?q=my-page/?something and on the second hop, as it will not match, it will append another "q=" and so on...

one of the reasons is because of the whole QTX_URL_QUERY thing, that maybe is incompatible with nginx way of getting permalink to work.

[herrvigg]

Comment by johnclause
Thursday Apr 02, 2015 at 16:50 GMT

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Hi, you explained the same thing over, but no new information. I need to see $_SERVER variables as they defined on your server. I also have no idea where 'q=' comes from.

[herrvigg]

Comment by brodock
Thursday Apr 02, 2015 at 17:04 GMT

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this is from "info.php"
do you need one generated from a page that goes by wordpress or is it enough?

_SERVER["USER"] www-data
_SERVER["HOME"] /var/www
_SERVER["FCGI_ROLE"]    RESPONDER
_SERVER["QUERY_STRING"] no value
_SERVER["REQUEST_METHOD"]   GET
_SERVER["CONTENT_TYPE"] no value
_SERVER["CONTENT_LENGTH"]   no value
_SERVER["SCRIPT_FILENAME"]  /usr/share/nginx/www/info.php
_SERVER["SCRIPT_NAME"]  /info.php
_SERVER["REQUEST_URI"]  /info.php
_SERVER["DOCUMENT_URI"] /info.php
_SERVER["DOCUMENT_ROOT"]    /usr/share/nginx/www
_SERVER["SERVER_PROTOCOL"]  HTTP/1.1
_SERVER["GATEWAY_INTERFACE"]    CGI/1.1
_SERVER["SERVER_SOFTWARE"]  nginx/1.2.1
_SERVER["REMOTE_ADDR"]  187.94.99.90
_SERVER["REMOTE_PORT"]  50111
_SERVER["SERVER_ADDR"]  192.241.217.197
_SERVER["SERVER_PORT"]  80
_SERVER["SERVER_NAME"]  192.241.217.197
_SERVER["HTTPS"]    no value
_SERVER["REDIRECT_STATUS"]  200
_SERVER["HTTP_HOST"]    192.241.217.197
_SERVER["HTTP_USER_AGENT"]  Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Firefox/38.0
_SERVER["HTTP_ACCEPT"]  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
_SERVER["HTTP_ACCEPT_LANGUAGE"] pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3
_SERVER["HTTP_ACCEPT_ENCODING"] gzip, deflate
_SERVER["HTTP_DNT"] 1
_SERVER["HTTP_CONNECTION"]  keep-alive
_SERVER["PHP_SELF"] /info.php
_SERVER["REQUEST_TIME_FLOAT"]   1427994207.662
_SERVER["REQUEST_TIME"] 1427994207

[herrvigg]

Comment by johnclause
Thursday Apr 02, 2015 at 17:06 GMT

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There is no query string on this one?
From first reply:

Please, paste here $_SERVER vars at trouble from your server

[herrvigg]

Comment by brodock
Thursday Apr 02, 2015 at 17:14 GMT

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I'm sorry, here is a new one:

_SERVER["USER"] www-data
_SERVER["HOME"] /var/www
_SERVER["FCGI_ROLE"]    RESPONDER
_SERVER["QUERY_STRING"] querystring&another=true
_SERVER["REQUEST_METHOD"]   GET
_SERVER["CONTENT_TYPE"] no value
_SERVER["CONTENT_LENGTH"]   no value
_SERVER["SCRIPT_FILENAME"]  /usr/share/nginx/www/info.php
_SERVER["SCRIPT_NAME"]  /info.php
_SERVER["REQUEST_URI"]  /info.php?querystring&another=true
_SERVER["DOCUMENT_URI"] /info.php
_SERVER["DOCUMENT_ROOT"]    /usr/share/nginx/www
_SERVER["SERVER_PROTOCOL"]  HTTP/1.1
_SERVER["GATEWAY_INTERFACE"]    CGI/1.1
_SERVER["SERVER_SOFTWARE"]  nginx/1.2.1
_SERVER["REMOTE_ADDR"]  187.94.99.90
_SERVER["REMOTE_PORT"]  48627
_SERVER["SERVER_ADDR"]  192.241.217.197
_SERVER["SERVER_PORT"]  80
_SERVER["SERVER_NAME"]  192.241.217.197
_SERVER["HTTPS"]    no value
_SERVER["REDIRECT_STATUS"]  200
_SERVER["HTTP_HOST"]    192.241.217.197
_SERVER["HTTP_USER_AGENT"]  Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Firefox/38.0
_SERVER["HTTP_ACCEPT"]  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
_SERVER["HTTP_ACCEPT_LANGUAGE"] pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3
_SERVER["HTTP_ACCEPT_ENCODING"] gzip, deflate
_SERVER["HTTP_DNT"] 1
_SERVER["HTTP_CONNECTION"]  keep-alive
_SERVER["PHP_SELF"] /info.php
_SERVER["REQUEST_TIME_FLOAT"]   1427994870.8975
_SERVER["REQUEST_TIME"] 1427994870

[herrvigg]

Comment by brodock
Thursday Apr 02, 2015 at 17:17 GMT

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I'm not sure if this applies, but nginx vhost have the following configured:

        location / {
                try_files $uri $uri/ /index.php?q=$uri$is_args&$args;
        }

[herrvigg]

Comment by johnclause
Thursday Apr 02, 2015 at 17:21 GMT

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That shows no surprises on REQUEST_URI:

_SERVER["REQUEST_URI"] /info.php?querystring&another=true

which invalidates your previous explanation.

I'm not sure if this applies, but nginx vhost have the following configured:

Aha, this is where 'q=' come from, then fix it 👍

[herrvigg]

Comment by brodock
Thursday Apr 02, 2015 at 17:29 GMT

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I was unsure if that line was really needed. I got solved by changing it to:

        location / {
                try_files $uri $uri/ /index.php?$args;
        }

the culprit was that missleading tutorial from digitalocean that my client followed: https://www.digitalocean.com/community/tutorials/how-to-install-wordpress-with-nginx-on-ubuntu-12-04

I'm filling the missing parts here to help anyone having the same issue.

Thank you very much for your time,

Cheers

[herrvigg]

Comment by johnclause
Thursday Apr 02, 2015 at 17:32 GMT

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I am glad, Gabriel, that it was that simple. Can you change the title of this thread, so that people can see that they can get help with this kind of installation? Best regards.

[herrvigg]

Comment by johnclause
Thursday Apr 02, 2015 at 17:48 GMT

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I thought that you may not have the ability to change title, and decided to change it myself. Now I know you can. Thanks a lot.