Reverse proxy applications
Proxy to an application
Send requests to a local application and understand how the proxypass URI changes upstream paths.
8 minute lesson
A reverse proxy accepts the public request and makes a separate request to an upstream application.
proxy_pass can target a TCP address or Unix socket. A trailing URI changes how Nginx replaces the matched location prefix. Test the exact upstream path instead of guessing.
Run a local test application that prints its request path. Proxy /app/ to it and compare proxy_pass forms with and without a trailing slash.
Proxy one location to a local application:
location /api/ {
proxy_pass http://127.0.0.1:3000/;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-Proto $scheme;
}Test the application directly first, then through Nginx. Notice the trailing slash behavior in proxy_pass. Inspect both access logs and application logs so you can follow one request across the proxy boundary.
Lesson completed