Shulou(Shulou.com)06/03 Report--

Suppose the configuration in nginx looks like this:

Server {

Listen 80

Server_name x.x.x.x

. . . . . .

Location / subdir

{

Proxy_pass http://y.y.y.y;

}

}

Then, when the user requests http://x.x.x.x/subdir/other, matching to that block, nginx reverse proxies to the backend will retain the virtual path. The request URL that nginx actually initiates to the backend is http://y.y.y.y/subdir/other.

Suppose the configuration in nginx looks like this:

Server {

Listen 80

Server_name x.x.x.x

. . . . . .

Location / subdir

{

Proxy_pass http://y.y.y.y/;

}

}

Then, when the user requests http://x.x.x.x/subdir/other, the block is matched, and because the backend URI path is specified in the proxy_pass, the nginx agent will not retain the virtual path when it requests to the backend. The request URL that nginx actually initiates to the backend is http://y.y.y.y//other.

Suppose the configuration in nginx looks like this:

Server {

Listen 80

Server_name x.x.x.x

. . . . . .

Location / subdir

{

Proxy_pass http://y.y.y.y/upstream_subdir;

}

}

Then, when the user requests http://x.x.x.x/subdir/other, the block is matched, and because the backend URI path is specified in the proxy_pass, the nginx agent will not retain the virtual path when it requests to the backend. The request URL that nginx actually initiates to the backend is http://y.y.y.y/upstream_subdir/other.

Summing up the above three examples, we can find that the crux of the problem is whether the URI of the specified backend server is specified in the proxy_pass instruction, which determines whether the virtual path in the location will be retained when the nginx proxy requests to the backend.

When the back-end server is written in upstream mode, the effect is the same. For example:

Upstream backend {

Server y.y.y.y:80

}

Server {

Listen 80

Server_name x.x.x.x

. . . . . .

Location / subdir

{

Proxy_pass http://backend/upstream_subdir;

}

}

When a user requests a http://x.x.x.x/subdir/other, the actual request URL that the nginx initiates to the backend is still http://y.y.y.y/upstream_subdir/other.

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