Redirect request coming from a IP:$Port/$url to some flask API using Nginx.

Hi how can I use nginx to redirect requests coming to a structure like IP:$Post/$url for e.g. localhost:4000/savedata to some other API which I have made? I am able to redirect the requests coming to “localhost:4000” to my API, but I am not able to figure out how to incorporate the url part as well.

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Instead of a redirect, it sounds like you want to set up nginx as a proxy to your API. Using the proxy_pass variable you can set up nginx to proxy communications to your API. This guide may be helpful, while it is about setting up nginx to proxy connections to apache, the details on how to configure nginx to proxy connections are the same.