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Bitbucket trying to emulate a POST request by the online editor


I am trying to use Python to simulate the POST request made by the Bitbucket Online Editor (no commit api yet). Here is what I did:

  1. Tracked the POST request using Firebug in Firefox
  2. Copied the POST request headers
  3. Copied the POST request body (in application/json format)


Here is the code I use to POST my request, but it's a bit long and not very relevant. My Content-Type is application/json, and my POST body is a JSON-encoded string.

dataString = '{"branch":"master","files":[{"path":"readme.txt","content":"ntestxx\n \n"}],"message":"readme.txt edited online with Bitbucket","parents":["465305dc4da32f91da057b65297cda9b72c4a8e4"],"repository":{"full_name":"xxxxx/xxxxxxx"},"timestamp":"2014-03-20T23:49:29.759Z","transient":false}'
    headers = {'X-CSRFToken': '6TqWjCl698U99Iu6ZYGBAloCxZ', 'Content-Length': '2190', 'Accept-Language': 'en,en-us;q=0.7,zh;q=0.3', 'X-NewRelic-ID': 'VwMGVVZSGwIIUFBQDwU=, VwMGVVZSGwIIUFBQDwU=', 'Cookie': 'csrftoken=6TqWjCl698U99Iu6ZYGBAloCxZ; __utma=254090395.1171276563.1394767875.1394776803.1395358874.3; __utmc=254090395; __utmz=254090395.1394776803.2.2.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); bb_session=gpqergylgoa7icpwosqsbpxig0; __utmv=254090395.|1=isBBUser=true=1; recently-viewed-repos_1701252=3802872%2C108928; __utmb=254090395.21.9.1395359363952', 'Connection': 'keep-alive', 'Accept': 'application/json, text/javascript, */*; q=0.01', 'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:27.0) Gecko/20100101 Firefox/27.0', 'Host': '', 'X-Requested-With': 'XMLHttpRequest', 'Pragma': 'no-cache', 'Cache-Control': 'no-cache', 'Referer': '', 'Content-Type': 'application/json; charset=UTF-8', 'Accept-Encoding': 'gzip, deflate'}
    edit ="!api/internal/repositories/xxxxxxxx/xxxxxxxxx/oecommits/", data=dataString, headers=headers)
Results vs. expected results:

When I perform the POST request using my Firefox web browser (using Firebug's "resend request" function), I get a 409 CONFLICT response (Which is the desired response! I am simulating a request to an online editor, so that should be the correct response to a re-sent edit).

However, when I try to simulate the request by copying the request header and the request body, I get a 400 BAD REQUEST response, and the response contains no other information, so I don't even know what my problem is.

Regardless of how many times I send the POST in the web-browser (despite an incorrect timestamp), it achieves the intended outcome, but the server refuses to accept any requests I make using the python requests library.

Response using browser request:


Server: nginx/1.5.10
Date: Fri, 21 Mar 2014 00:20:55 GMT
Content-Type: text/plain
Content-Length: 45
Connection: keep-alive
x-served-by: app16
X-Render-Time: 0.558492183685
Content-Language: en
X-Static-Version: 48695e7c3140
Vary: Authorization, Accept-Language, Cookie
X-Version: e6778a5040f7
Etag: "92f0b780984e984140de0f8ed0a3992c"
X-Frame-Options: SAMEORIGIN
X-Request-Count: 483
Specified change not on head of branch master

Response using python request:


content-length: 11
x-served-by: app10
x-render-time: 0.012787103653
content-language: en
content-type: text/plain
vary: Authorization, Accept-Language, Cookie
connection: keep-alive
server: nginx/1.5.10
x-version: e6778a5040f7
etag: "825644f747baab2c00e420dbbc39e4b3"
x-request-count: 321
date: Fri, 21 Mar 2014 00:51:01 GMT
x-frame-options: SAMEORIGIN
x-static-version: 48695e7c3140



Some of my ideas:

I am thinking that perhaps there is another component to a HTTP POST request that I need to simulate? Perhaps when Firefox sends a POST request, there is some header or wrapper added that makes the request valid?

Or is there something more to a POST request than just a method, headers, and body?

Maybe it's something to do with the fact that it's HTTPS instead of HTTP?

2 answers

1 accepted

0 votes
Answer accepted

It turned out I was forgetting to escape the newline characters when I copied the json body from the Firebug tracker to the Python script. read more details at

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