Request Rewriting not working as expected with regex

[Deepak1711]

I am using following tar: gor_1.3.3_x64.tar.gz

Gor command used:
./gor --input-raw :3000 --output-http="http://athena-service.uranus.svc.cluster.local"
--http-rewrite-url "/onemg-internal/end_user/v1/drug_skus/(\d+)/dynamic:/pharma-pdp/v1/drug/dynamic/$1"
--http-allow-url "/onemg-internal/end_user/v1/drug_skus/(\d+)/dynamic"

Request is being received at the output server, but the regex group is not captured inside $1.

As you can see in the above SS, the uri is /pharma-pdp/v1/drug/dynamic/ while it should have been /pharma-pdp/v1/drug/dynamic/1234.

Can somebody help with this?

[dosubot]

🤖

Hello @Deepak1711! 👋

I'm Dosu, an AI bot that helps with bug-solving, Q&A, and onboarding contributors. While we're waiting for a human maintainer, I'm here to help with your GoReplay journey. Don't worry, we'll get your issue sorted out! 😊💻🚀

Based on your description, it seems like you're experiencing an issue with the --http-rewrite-url command in GoReplay v1.3.3. The regular expression group should indeed be captured inside $1 when using this command.

Your command appears to be correct:

./gor --input-raw :3000 --output-http="http://athena-service.uranus.svc.cluster.local" \
--http-rewrite-url "/__onemg-internal__/end_user/v1/drug_skus/(\d+)/dynamic:/pharma-pdp/v1/drug/dynamic/$1" \
--http-allow-url "/__onemg-internal__/end_user/v1/drug_skus/(\d+)/dynamic"

This command should rewrite all /__onemg-internal__/end_user/v1/drug_skus/<drug_id>/dynamic requests to /pharma-pdp/v1/drug/dynamic/<drug_id>.

If the regex group is not being captured correctly, it might be a bug in the version of GoReplay you're using. I would recommend updating to the latest version of GoReplay and trying again. If the problem persists, it might be worth reporting this as a bug to the GoReplay team.

The --http-rewrite-url command in GoReplay v1.3.3 is used for rewriting URLs based on a mapping. It expects a value in the ":" format, where ":" is a delimiter. In the <replace> section, you can use captured regexp group values. This works similarly to the replace method in Javascript or gsub in Ruby.

For more information, you can refer to the Request Rewriting section in the GoReplay documentation.

I hope this helps! If you have any other questions or need further clarification, feel free to ask.

-Dosu

Sources

• Request Rewriting

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[Deepak1711]

It seems I am already on the latest stable version. Reference: https://github.com/buger/goreplay/releases