Nginx add location details to URL when we stop decoding URL

Server NGINX
1

I am accessing a URL which has encode characters

http:…/malintha/tel%3A%2B6281808147137

location /gateway/ {
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://10.1.1.1:9443$request_uri/;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection “upgrade”;
proxy_http_version 1.1;
}

I added $request_uri at then end of the proxy_pass URL as I have to stop
decoding by nginx.

When I configure like this nginx resolve it to (stop decoding but
incorrect
URL - adding /gateway/)

/gateway/malintha/tel%3A%2B6281808147137

but When I remove $request_uri it resolve to correct URL (but with
decoding)

How can I resolve this ?

malintha/tel:+6281808147137

Posted at Nginx Forum:

2

Hello!

On Fri, Feb 13, 2015 at 01:07:15AM -0500, malintha wrote:

proxy_set_header Host $http_host;

When I configure like this nginx resolve it to (stop decoding but incorrect
URL - adding /gateway/)

/gateway/malintha/tel%3A%2B6281808147137

What makes you think that nginx is adding “/gateway/”? As per
the location specification, the $request_uri is expected to
contain “/gateway/” in it.

but When I remove $request_uri it resolve to correct URL (but with
decoding)

With $request_uri in proxy_pass nginx will assume you’ve specified
full URI yourself and it shouldn’t be changed. When you remove
$request_uri nginx will follow it’s normal logic to replace
matching part of $uri with the URI part specified in the
proxy_pass directive, and will encode the result as appropriate.
See Module ngx_http_proxy_module for details.

If you want nginx to preserve the encoding as it was in the
original client request, and want to strip “/gateway/” part from
the URI at the same time, you may do so by manually removing the
“/gateway/” from the $request_uri variable, like this (untested):

set $modified_uri $request_uri;

if ($modified_uri ~ "^/gateway(/.*)") {
    set $modified_uri $1;
}

proxy_pass http://upstream$modified_uri;

Note though, that this will not work in some characters in the
“/gateway/” are escaped by the client.

–
Maxim D.
http://nginx.org/

3

hi Maxim ,

Your answer is right and thank you for it. I applied it with small
correction.

set $modified_uri $request_uri;

if ($modified_uri ~ “^/gateway(/.*)”) {
set $modified_uri $1;
}

proxy_pass http://upstream$1;

Thank you,
Malintha

Posted at Nginx Forum: