Detailed explanation of various usages of proxy_pass in nginx

Proxy forwarding rules

When configuring location proxy forwarding rules in nginx, different writing methods correspond to different forwarding rules.

If proxy_pass uses a URI, when the request is transmitted to the backend server, the matching part of the normalized request path and the path in the configuration will be replaced by the URI defined in the directive (corresponding to the first case below).

If proxy_pass is not used with a URI, the request URI sent to the backend server is generally the original URI initiated by the client (the second case below).

Access address: http://localhost/proxy/abc.html

Here are some common matching scenarios:

The first one:

location /proxy/ {
proxy_pass http://127.0.0.1:8080/;
}

Proxy to: http://127.0.0.1:8080/abc.html

Second type:

location /proxy/ {
proxy_pass http://127.0.0.1:8080;
}

Compared with the first proxy_pass, it lacks /
Proxy to: http://127.0.0.1:8080/proxy/abc.html

The third type:

location /proxy/ {
proxy_pass http://127.0.0.1:8080/api/;
}

Proxy to: http://127.0.0.1:8080/api/abc.html

The fourth type:

location /proxy/ {
proxy_pass http://127.0.0.1:8080/api;
}

Less than the third type/
Proxy to: http://127.0.0.1:8080/apiabc.html

location /proxy {
proxy_pass http://127.0.0.1:8080/api;
}

Proxy to: http://127.0.0.1:8080/api/abc.html

Fifth:

location /proxy {
proxy_pass http://127.0.0.1:8080/;
}

Proxy to: http://127.0.0.1:8080//abc.html
Note that there are two backslashes //

location /proxy {
proxy_pass http://127.0.0.1:8080;
}

Proxy to: http://127.0.0.1:8080/proxy/abc.html

Here is an explanation from the official documentation:

NGINX-httpproxy module official documentation Chinese documentation translated by Alibaba tengine - recommended reading

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