Consider the following nginx config blocks
location / {
proxy_pass http://127.0.0.1:8080;
}
and
location / {
proxy_pass http://127.0.0.1:8080/;
}
They are both same in terms of final result. You if call /foo/bar on the main server it passes the request to http://127.0.0.1:8080/foo/bar
But as soon as you have a location block with a non-root path like below
location /app {
proxy_pass http://127.0.0.1:8080;
}
The above config is not same as below
location /app/ {
proxy_pass http://127.0.0.1:8080/;
}
Below table shows different combinations of the location and the proxy_pass url and the final path that the backend server will receive
Proxy Pass and Paths
| Case # | Nginx location | proxy_pass URL | Test URL | Path received |
|---|---|---|---|---|
| 1 | /test1 | http://127.0.0.1:8080 | /test1/foo/test | /test1/foo/test |
| 2 | /test2 | http://127.0.0.1:8080/ | /test2/foo/test | //foo/test |
| 3 | /test3/ | http://127.0.0.1:8080 | /test3/foo/test | /test3/foo/test |
| 4 | /test4/ | http://127.0.0.1:8080/ | /test4/foo/test | /foo/test |
| 5 | /test5 | http://127.0.0.1:8080/app1 | /test5/foo/test | /app1/foo/test |
| 6 | /test6 | http://127.0.0.1:8080/app1/ | /test6/foo/test | /app1//foo/test |
| 7 | /test7/ | http://127.0.0.1:8080/app1 | /test7/foo/test | /app1foo/test |
| 8 | /test8/ | http://127.0.0.1:8080/app1/ | /test8/foo/test | /app1/foo/test |
| 9 | / | http://127.0.0.1:8080 | /test9/foo/test | /test9/foo/test |
| 10 | / | http://127.0.0.1:8080/ | /test10/foo/test | /test10/foo/test |
| 11 | / | http://127.0.0.1:8080/app1 | /test11/foo/test | /app1test11/foo/test |
| 12 | / | http://127.0.0.1:8080/app2/ | /test12/foo/test | /app2/test12/foo/test |
Note: When you have a trailing
/in theproxy_passurl then theurlmentioned in the location block is removed from the actual url starting and rest of the pass is sent to the proxied server as seen in Case #4