Header Editor

Modify response body

Read Before Use

This feature allows you to modify the response body of a request.

Using this feature may cause the following issues:

  • Access speed and resource usage may be affected to some extent.
  • Some content downloads may be affected.

On Chrome, you may see a prompt indicating that "Header Editor" started debugging this browser. This is because HE uses the chrome.debugger API. If you prefer not to see this prompt, you can:

  • Disable "Modify Response Body" in "Options".
  • Add the --silent-debugger-extension-api parameter when running Chrome.

Configuration

Encoding

HE uses UTF-8 to decode transmitted content by default. If the website is not encoded in UTF-8, you will need to manually specify the encoding.

Please note that this encoding is only used for decoding. The modified response is always encoded in UTF-8.

If you don't know the encoding used by a webpage, open the console (press F12), switch to the Network tab, refresh the current page, and observe the Content-Type in the Response Headers.

Encoding list

Request Stage

In Chrome, you can choose when to intercept the request.

  • Request
    • The request isn't actually sent to the server, and you can't access the server's response headers or body.
    • In most cases, you may need to manually configure the Content-Type.
    • Intercepting at this phase offers better performance because you don't need to wait for a response from the server.
  • Response
    • The response is received from the server, and you need to wait for it.
    • You can access the server's response headers and body in a custom function.

In Firefox, this is always the response stage.

Custom Function

The function takes two parameters: the first is the decoded text, and the second is the custom function's detail object. The function returns the modified text.

For example, the following function replaces all occurrences of "baidu" on a webpage with "Google."

return val.replace(/baidu/g, 'Google');

You can use detail.browser to get the browser type, which can be either chrome or firefox.

Known Issues

  • On Chrome, response modifications do not take effect when accessing a site for the first time in a new tab.
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