Several issue while using FiddlerCore

2 posts, 0 answers
  1. Raymond
    Raymond avatar
    1 posts
    Member since:
    Dec 2017

    Posted 15 Feb 2018 Link to this post

    Could anybody please help me with the following issues of FiddlerCore?

    I'm evaluating it for our use in products and have built a C# program to test it on win7 32/64 bit and Win10 64bit. It's based on the reference code from but simplified with just hook up to BeforeRequest and BeforeResponse.

    1. Memory leak - after processing 674 HTTP/HTTPS requests, Task Manager shows that my program uses 139MB memory. VS2017's Performance Profiler shows multiple memory allocation inside FiddlerCore which seem never being released.

    2. CPU spike - in a win7 64bit environment, it consistently gives 80+% CPU usage.

    3. Certificate installation does not always happens. Sometimes it seems that CertMaker.rootCertExists() or other related functions do not work correctly and the pop-up dialog is not shown.

    4. I call "FiddlerApplication.Startup(8888, true, true, true);" to set Fiddler as the system-wide proxy. But the FidllerCore's log complains that "AutoProxy failed. Disabling for this network." Is it an issue here?

    I'm using 4.6.20172.35715 and the above issues happen on both .net 2 and .net 4 libs.

    Also, is there a doc for the interfaces and parameters, especially for the troubleshooting and performance tuning? Thanks.

  2. Alexander
    Alexander avatar
    383 posts

    Posted 25 Feb 2018 Link to this post


    Would it be possible to send us the sample project, so we can attempt to reproduce the problems you experience?

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