Intercept HTTP request body from chrome extension

user_249161 0
Viewed 19613

I'm aware that chrome.webRequest.onBeforeRequest allows a request to be intercepted, analyzed and blocked, but it only allows access to the request headers, and not the request body (as far as i know).

Sample use case: think intercepting form values.

It seems there is a API change proposal here suggesting exactly this.

Is there another way this could be accomplished?

Thanks.

google-chrome-extension google-chrome javascript
3 Answers

Here is what I did

  1. I used the requestBody to get the post requests body
  2. I used a decoder the parse the body into a string

Here is an example 

chrome.webRequest.onBeforeRequest.addListener(
    function(details) {
        if(details.method == "POST")
        // Use this to decode the body of your post
            var postedString = decodeURIComponent(String.fromCharCode.apply(null,
                                      new Uint8Array(details.requestBody.raw[0].bytes)));
           console.log(postedString)

    },
    {urls: ["<all_urls>"]},
    ["blocking", "requestBody"]
);
user_116241370
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