Is it possible to rewrite a status code with Charles Proxy?

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刺人心
刺人心 2021-01-30 15:57

I\'m using Charles Proxy to rewrite a response from an API for testing purpose.

If I set a breakpoint, I am allowed to completely rewrite the raw response as I wish.

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  • 2021-01-30 16:13

    An Update: Version 3.8 of Charles Proxy was just released, with the ability to rewrite the status. From the release notes:

    • Rewrite tool: allow rewriting of response status

    This version's rewrite UI adds a new "Response Status" rule type:

    enter image description here

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  • 2021-01-30 16:13

    1- Select Tools > Rewrite or OPTION + CMD + R


    2- Select Enable Rewrite and then select Add


    3- Fill the fields with your details


    4- Add type and action


    5- Select type of action - Response Status for our case -, write value to be changed -500-, write value for replace -200-


    Final Step:

    6- You are ready to manipulate status code of your response with Charles

    Official site of Charles Web Debugging Proxy

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  • 2021-01-30 16:35

    It's not a direct answer to Charles, but you can write JS code to change the HTTP Response at ease with Proxyman (Scripting feature)

    For instance,

    function onResponse(url, request, response) {
        // Change to 404 status code for the matching request
        response.statusCode = 404; 
        return response;
    }
    

    Here is full list of Snippet Code that you can do:

    Disclaimer: I'm a creator of Proxyman. Hope it can help you.

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  • 2021-01-30 16:40

    Using Charles 3.8+, you can rewrite the status code.

    In the rewrite tool, select "Type: response status". In the match fields and replace fields, be aware that Charles expects the incoming and rewritten statuses to match the format "\d{3} .*". This means that your rewritten status must have a message portion in addition to the numeric status code.

    For example:

    Match value: 201 .*

    Replace value: 502 Bad Gateway

    Omitting the message from the replace value will result in no rewrite of the status line. You can see Charles' rewrite tool output messages in the Notes section of each call's summary.

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  • 2021-01-30 16:40

    This is not a direct answer to your question, but as noted in my comment above I was in the same situation and I found a solution using a different tool that works well for me.

    Instead of Charles, I run mitmproxy, specifically mitmdump, with this short Python rewriting script:

    #!/usr/bin/env python
    
    def response(context, flow):
        if '/somePath' not in flow.request.path:
            return
    
        flow.response.status_code = 404
    

    To hook it into the proxy, I run mitmdump like this:

    mitmdump -s /path/to/rewriting-script.py
    

    and it works great.

    I'm on OS X and I configured the network interface's web proxy to 127.0.0.1 port 8080.

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  • 2021-01-30 16:40

    Final Edit: Marc Liyanage's answer is the most correct for this question now.

    No, you're not, I don't think it is possible to rewrite a status code.

    I cannot add this as a comment (new user) but one workaround is:

    1. Create resources on a server that will return the codes you need, or find ones that do.
    2. Use the Map Remote feature, mapping to the resource that returns the code.

    I've tried using Map Local, which would be perfect for this, but Charles adds it's own 200 OK status code to all files returned.

    Edit: Also you can use breakpoints on individual responses and modify the code.

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