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Nginx: Docker Redirect
Spin off a new Nginx container in docker.
docker run --name nginx-web1 -p 8080:80 nginx
Go in side the newly created container.
docker exec -it nginx-web1 /bin/bash
Create some folders and files inside the root of http.
cd /usr/share/nginx/html mkdir -p foo/bar echo "<h1>Folder: /foo/bar/ File: index.html</h1>" > index.html
We will get something like this:
.
|-- 50x.html
|-- foo
| `-- bar
| `-- index.html
`-- index.htmlNow see what happens if we try to go to this url:
curl localhost:8080/foo/bar
* Trying 127.0.0.1:8080... * Connected to localhost (127.0.0.1) port 8080 (#0) > GET /foo/bar HTTP/1.1 > Host: localhost:8080 > User-Agent: curl/7.85.0 > Accept: */* > * Mark bundle as not supporting multiuse < HTTP/1.1 301 Moved Permanently < Server: nginx/1.23.2 < Date: Tue, 22 Nov 2022 08:22:47 GMT < Content-Type: text/html < Content-Length: 169 < Location: http://localhost/foo/bar/ < Connection: keep-alive < <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>nginx/1.23.2</center> </body> </html> * Connection #0 to host localhost left intact
You can see on line 14 above that it redirect our request to:
Location: http://localhost/foo/bar/And when our browser follows to that location, it will complain because there are no service at localhost port 80.
curl -L localhost:8080/foo/bar
curl: (7) Failed to connect to localhost port 80 after 0 ms: Connection refused
To fix this we need to add one directive in our config.
absolute_redirect off;
Syntax: absolute_redirect on | off;Default: absolute_redirect on; Context: http,server,locationThis directive appeared in version 1.11.8.
If disabled, redirects issued by nginx will be relative.
See also server_name_in_redirect and port_in_redirect directives.
Now when you try to visit the url:
curl localhost:8080/foo/bar
* Trying 127.0.0.1:8080... * Connected to localhost (127.0.0.1) port 8080 (#0) > GET /foo/bar HTTP/1.1 > Host: localhost:8080 > User-Agent: curl/7.85.0 > Accept: */* > * Mark bundle as not supporting multiuse < HTTP/1.1 301 Moved Permanently < Server: nginx/1.23.2 < Date: Tue, 22 Nov 2022 09:06:39 GMT < Content-Type: text/html < Content-Length: 169 < Connection: keep-alive < Location: /foo/bar/ < <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>nginx/1.23.2</center> </body> </html> * Connection #0 to host localhost left intact
The Location header on line 15 show relative path which interpreted to browser as localhost:8080/foo/bar/.
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