“proxy_pass” cannot have URI part in location given by regular expression

Question

I\'ve developed a URL shortening web application.

It consists of two separate docker containers: one containing the backend REST api and another containing the fron

Answer 1

If you use a URI with a proxy_pass statement within a regular expression location, you need to build the entire URI using one or more variables. See this document for details.

So the alternatives are to (1), capture the URI from the location expression and add it to the proxy_pass statement. For example:

location ~ ^/([A-Za-z0-9]+) {
    proxy_pass http://api/urlshortener/v1/$1;
}

Or (2), use proxy_pass without a URI part, and construct the desired URI using a rewrite...break. For example:

location ~ ^/([A-Za-z0-9]+) {
    rewrite ^/([A-Za-z0-9]+) /urlshortener/v1/$1 break; 
    proxy_pass http://api;
}

See this document for details.