Getting 400 Bad Request for unknown reasons

3 posts, 0 answers
  1. Neil
    Neil avatar
    4 posts
    Member since:
    Feb 2015

    Posted 11 Feb 2015 Link to this post

    I have been using Fiddler on my PC while sending traffic to it from my phone (Android 4.4.4). I can see all non-SSL and SSL traffic from our website within Fiddler, with no issues.
    When I load our mobile app, however (which is partly-native and partly a wrapper for some parts of our mobile site), many (most) non-SSL pages are causing 400's (only through Fiddler). 

    Fiddler Log show these type of errors when it happens:
    15:36:11:3018 [Fiddler] No HTTPS request was received from (chrome:6192) new client socket, port 58271.

    In the raw requests for these it shows a simple GET to our website but the pages I am trying to visit are not the homepage, so I am not sure how it's munging up the requests. The actual homepage is and those are loading fine.

    Auto-Responder is disabled and I am doing no other re-writing that I can see, with the requests.
    I have been able to reproduce this on multiple networks.
    I cannot recreate the issue in other proxy tools.

    Let me know if there is any more information I can provide which may help me get assistance
  2. Eric Lawrence
    Eric Lawrence avatar
    832 posts

    Posted 12 Feb 2015 Link to this post

    Hi, Neil--

    Can you send me a SAZ file (Help > Send Feedback) showing the problem?

    Are any of the pages in question HTTPS?

    The LOG messages you're showing me here are from Chrome on your PC, not related to any requests from your phone.

    How specifically did you configure your phone to send traffic to Fiddler? Is your phone tethered to your PC in some way? If so, are you using Desktop Chrome's Developer tools?

    Eric Lawrence

    Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

  3. Neil
    Neil avatar
    4 posts
    Member since:
    Feb 2015

    Posted 12 Feb 2015 in reply to Eric Lawrence Link to this post

    I am not tethering in any way.  I am not yet loading SSL pages in the case of this issue.
    I am on the same wi-fi network with both my laptop and phone.  My phone's (Android 4.4.4) wi-fi proxy is set to my laptop's IP and port which I specified in Fiddler.  Chrome Developer tools are not open, I am simply loading things on my phone through the browser or app, and then inspecting the requests/responses in Fiddler.  I tried Charles and cannot reproduce this same result.

    It's a bit tricky to explain but essentially we are simply loading and then I click on a link that should load (for example) and it shows a GET to with a 400 response.  This is after two successfull 200 requests that are our actual homepage.   There are obviously many other objects being loaded with each of these pages but for sake of this post this is essentially whats happening.

    So you want me to email the .saz file to (as opposed to attaching here)?

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