How to set url path in application gateway rewrite url for all incoming requests

ahd 105

I'm trying to to make use of application gateway requests to rewrite all the incoming requests, ex: https://mytest.com/api/v1/... to https://mytest.com/qa/api/v1... for path based requests.

I have a gateway rule, with path based url set to /qa/*

is it a good way to do it ?

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Silvia Wibowo 5,281 Reputation points Microsoft Employee

2025-01-16T02:50:49.2233333+00:00

Hi @ahd , please clarify your issue.You have an Application Gateway.

There's a screenshot about path-based routing (selecting backend target based on path).

Another screenshot about URL rewrite rule: /api rewritten to /qa/api.

Are those two issues separate or connected?
ahd 105 Reputation points

2025-01-16T15:31:14.32+00:00

Hello Silvia,

I have to modify the incoming requests in gateway, by appending /qa for all the requests that matches the pattern /api/v1/*. What is the right Set Url path that can be applied to all requests that contains /api/v1/.... ? In the diagnostics logs I could see the requestUri_s is same as originalRequestUriWithArgs_s, its not getting modified with the below rewrite-url reference : https://learn.microsoft.com/en-us/azure/application-gateway/rewrite-url-portal#verify-the-url-rewrite-through-access-logs

Where as, I tested for a single request with complete url (ex: /api/v1/version to /qa/api/v1/version and it works. My question is mostly about pattern matching rule to apply for all incoming requests that contains /api/.. in request uri.

Apply common rule for all the requests : https://mytest.com/api/v1/version or https://mytest.com/api/v2/something or https://mytest.com/api/example/path and append request uri with /qa and outcome should be https://mytest.com/qa/api/v1/version and so on for other reqests in all above cases.

Accepted answer

Silvia Wibowo 5,281 Reputation points Microsoft Employee

2025-01-16T23:26:30.8933333+00:00
Hi @ahd , I understand you're asking about pattern matching for Application Gateway rewrite rule. You want to rewrite the path with pattern "/api/anycharacterafterit" to "/qa/api/anycharacterafterit".

Application Gateway uses regular expressions for pattern matching. You should use Regular Expression 2 (RE2) compatible expressions when writing your pattern matching syntax.

I think this will achieve what you're trying to do:

If

Type of variable to check: Server variable

Server variable: uri_path

Operator: equal (=)

Pattern to match: /api/(.*)

Then

Rewrite type: URL

Action type: Set

Components: URL path

URL path value: /qa/api/{var_uri_path_1}

For more information, see Pattern matching and capturing.

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Silvia Wibowo 5,281 Reputation points Microsoft Employee

2025-01-16T23:53:13.9466667+00:00

If the pattern to match is not quite right, try using backslash before slash (to notify the pattern match that it's literally a slash, not a regex special character):

Pattern to match: \/api\/(.*)
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