Hi,

hope you're doing well these days.

The best way to debug such situations is to enable a debugging log [1].
Hope that helps.

While I'm here I'd recommend to upgrade nginx instance to the
more recent stable version, i.e. 1.20.2.

References:
[1] https://nginx.org/en/docs/debugging_log.html

--
Sergey A. Osokin

On Tue, Apr 12, 2022 at 05:16:04AM -0400, gperrot wrote:
> Hello,
>
> I am using nginx/1.16.1 on CentOS Linux 7. I am using map directive for
> managing a large number of redirects from one server to another server :
>
> map $request_uri $new_uri {
> include /etc/nginx/conf/redirect.map;
> include /etc/nginx/conf/documentation.map;
> }
>
> In /etc/nginx/conf/documentation.map, I have 1200 redirections like those
> below (the first one works, the second one doesn't).
>
> '/Documentation/Security.html#External'
> 'https://support.communigate.com/en/guides/communigate-pro-manual/system-administration/security-2/external-authentication';
> '/Documentation/Helpers.html#AppHelpers'
> 'https://support.communigate.com/en/guides/communigate-pro-manual/applications/helper-applications/external-application-helpers;'
>
> If I try to use
> https://communigate.com/documentation/Helpers.html#AppHelpers (first
> redirection), I have "page not found (404)" and the logs are :
>
> 162.158.50.134 - - [12/Apr/2022:07:48:17 +0000] "GET
> /documentation//Helpers.html HTTP/2.0" 301 0 "-" "Mozilla/5.0 (X11; Linux
> x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75
> Safari/537.36"
> 162.158.50.134 - - [12/Apr/2022:07:48:17 +0000] "GET
> /documentation/Helpers.html HTTP/2.0" 404 45842 "-" "Mozilla/5.0 (X11; Linux
> x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75
> Safari/537.36"
>
> If I try to use
> https://communigate.com/documentation//Security.html#External (second
> redirection), I have the page and the logs are :
>
> 141.101.68.139 - - [12/Apr/2022:07:50:26 +0000] "GET
> /documentation//Security.html HTTP/2.0" 301 0 "-" "Mozilla/5.0 (X11; Linux
> x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75
> Safari/537.36"
> 141.101.68.139 - - [12/Apr/2022:07:50:26 +0000] "GET
> /documentation/Security.html HTTP/2.0" 301 162 "-" "Mozilla/5.0 (X11; Linux
> x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75
> Safari/537.36"
>
> If I try to access from my nginx server to the destination URL
> https://support.communigate.com/en/guides/communigate-pro-manual/system-administration/security-2/external-authentication
> or
>
> I have tested there is no synthax error in my configuration file with :
>
> # nginx -c /etc/nginx/nginx.conf -t
> nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
> nginx: configuration file /etc/nginx/nginx.conf test is successful
>
> I also tried systemctl reload/restart nginx without results.
>
> Do you know how can I debug that ? Is there a way to check what are the
> requests done to destination host by my nginx server ?
>
> Thanks in advance for your help.
>
> Gilles
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