Nginx with location and regex: url containing string to http server, appending whole path

Question

Lets stay I have a site at https://www.example.com I want Nginx to redirect all requests to my site containing /rss/ to a server I have at the address 127.0.0.1:4003, appending /api/v1 and the whole path that was passed in the original request.

For example, a request to https://www.example.com/en/rss/blog would go to http://127.0.0.1/api/v1/en/rss/blog.

I tried with location, matching the url with regex:

location ~ ^.*\b(\/rss\/)\b.*$ {
  rewrite ^.*\b(\/rss\/)\b.*$ /api/v1$1 break;
  proxy_pass http://127.0.0.1:3007;
}

The redirection works, but is not appending the path, as I receive Cannot GET /api/v1/rss/ as response.

This is a problem with the regex I suppose, it should capture the whole path instead of /rss/ only; but how?

Any idea will be welcome!

Do not use word boundaries with special chars, try just location ~ .*(/rss/.*) — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Feb 16, 2022 at 22:22

Wiktor Stribiżew · Accepted Answer · 2022-02-16 22:41:36Z

1

Word boundaries constructs are context dependant, in case of \b\/rss\/\b, the pattern will only match when the /s are preceded/followed with word chars, i.e. letters, digits or _.

In your case, the regex should look like

location ~ .*(/rss/.*)
location ~ (/rss/.*)

I.e.

.* - match any text but line break chars
(/rss/.*) - Group 1 ($1): /rss string and then any text but line break chars

answered Feb 16, 2022 at 22:41

Wiktor Stribiżew

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