3

I'm catching HTTP requests made by Selenium using Browser Mob Proxy (using the browsermob-proxy Python package). In my HAR file, I see this (it should be a Javascript file):

"content": {
        "comment": "",
        "size": 10908,
        "mimeType": "application/x-javascript; charset=utf-8",
        "encoding": "base64",
        "text": "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"
      }

However, when decoding the text of the content using

base64.b64decode(my_coded_text).decode("UTF-8")

I invariably receive the following error:

UnicodeDecodeError: 'utf-8' codec can't decode bytes in position 0-1: invalid continuation byte

What's the proper way to decode such strings?

EDITED TO ADD

I'm assuming the issue comes from this line from rfc1341: "A CRLF sequence in base64 data should be converted to a quoted-printable line break, but ONLY when converting text data" because decoding works fine with images.

However, I've yet to understand what's a CRLF sequence in base64 data and how it can be converted.

Nicolas KB
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2 Answers2

0

I'm not sure what kind of data is supposed to be in the "text" property, but it sure isn't text. You'll need to analyze the application that made this request to figure this out.

The decoded text starts out with the following data, which doesn't contain any readable text, and doesn't match with any known file format:

00000000: e2a1 7614 9214 be79 5194 3352 a680 7a29  ..v....yQ.3R..z)
00000010: e064 8850 0375 fe03 f106 0ab6 1351 55cf  .d.P.u.......QU.
00000020: ad32 a1ef d6fb a2a4 96e4 30ab 203e eb8c  .2........0. >..
00000030: e3f1 46dd 155c 2e56 21c4 7987 df94 833f  ..F..\.V!.y....?

An analysis of the data shows that it's virtually incompressible. This means that it may be encrypted, or compressed with an unknown algorithm.

duskwuff -inactive-
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  • Thanks for your answer. What I don't get is that the browser (in this case Firefox through Selenium) decodes everything effortlessly (JS, CSS and HTML are encoded this way). Could it be that Browsermob does something to the response before putting it in the HAR? – Nicolas KB Jan 26 '18 at 18:34
0

I couldn't find a way to decode the base64 but I could find a workaround: sending the same request using selenium-requests and accessing the response which is, this time, not base64-encoded.

Code now looks like this:

for http_req in proxy.har["log"]["entries"]:
    req_url = http_req["request"]["url"]
    if url in req_url:
        # Captures the POST data
        payload = {}
        for post_param in http_req["request"]["postData"]["params"]:
            param_name = post_param["name"]
            param_value = post_param["value"]
            payload[param_name] = param_value

# Resends the post request
r = driver.request('POST', url, data=payload)
Nicolas KB
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