I want to capture traffic from a host using HTTP, but I do not see a response coming back. If I close fiddler, my application runs as normal.
I see '-' in the Result section, where it should have been an HTTP response code. If I manually execute the request using Composer, I get a 200 response. Fiddler is able to capture traffic from all other web applications without issue.
I have installed Fiddler certificate. Troubleshooting Mode returns 200. The host does not use HTTPS, but I have enabled Capture HTTPS Connects anyways.
I am using Fiddler v5.0.20182
Some applications performs certificate pinning. Also web applications can perform certificate pinning e.g. via HTTP Public Key Pinning (HPKP). If you have ever used the web application in your browser without Fiddler, the web app public key has been downloaded and cached in the web-browser.
Afterwards the Fiddler root certificate is no longer accepted for that site/app even it it has been installed correctly. You should be able to identify such problematic connections in Fiddler if you only see a CONNECT request but no subsequent requests to the same domain.
To delete the HPKP in your web browser you should use a fresh profile or clear the complete browser cache. Afterwards only use it with activated Fiddler proxy and SSL decryption. As far as I know Fiddler will remove HPKP data from responses so that the web application should also work with Fiddler in between.
I think you should be able to uncheck the options for https, uncheck the boxes which appear checked here? Or you might be able to skip decryption by adding the host in the box below where it says Skip decryption for the following hosts
Related
Background: I'm trying to send a request through cy.request and I get a different response from what I receive when I send a presumably similar request through PostMan. According to the debug information that Cypress writes to the console, I couldn't spot the difference. Therefore I wanted to look at Fiddler and see if I can spot the difference when looking at the raw requests side by side.
However, when I opened Fiddler I realized that I don't see any traffic from it, including the navigation to the home page using cy.visit().
Any ideas why I can't see the traffic in Fiddler, and if there's some way to capture it?
Fiddler is a proxy, it has to be explicitly used by an application, otherwise it will not be recogized by Fiddler.
There are three reasons that often cause that traffic is not visible in Fiddler:
The Windows application explicitly ignores the Windows/IE proxy settings. Usually such apps have an own proxy configuration. Configure it manually to use Fiddler. A common example of such an application is Firefox.
If you have activated the "Act as system proxy at startup" Fiddler changes the proxy settings while running. Any application that is already running when Fiddler starts may have already cached the old proxy configuration and therefore does not use Fiddler. Therefore start Fiddle before any program you want to capture.
The setting "Act as system proxy at startup" is AFAIK user specific, therefore any apps running on a different user or service account are not affected. You have to manually configure them to use Fiddler.
Cypress does not actually make an XHR request from the browser. Cypresd making the HTTP request from the Cypress Test Runner (in Node). So, you won’t see the request inside of your Developer Tools or filddler
I set everything well and some https request did be proxied well, but some are still unknown , is there any new way I don't known to prevent being proxied ?
I found that the https connections checked the cert on apps their own. Which means you can't just add the cert to your device's system and hope it works.
There are more works should be done to capture these data by using proxy.
More detailed things are you have to hack the app to capture. For those information just google "JustTrustMe".
I've been using Fiddler in C#.
So far I'm able to intercept requests. However, I need to set a proxy. I did so, the proxy is set.
In Proxy Settings Windows' form, I have for HTTP and Secure: 127.0.0.1 for Proxy address to use and for the Port, 8888.
This is the same that is done when I use Fiddler application directly.
However, when I set it through my C# code, instead of using Fiddler, I can't navigate. My pages give me the message:
Your connection is not secure
What more do I need to do? What Fiddler do that I'm missing to correctly set a proxy?
Usually if it cant make a secure connection, you need to trust Fiddler's root certificate on your development PC. If you are using Firefox you will have to do an additional step to trust the certificate inside FF.
I am creating a screen scrapping application which uses web whataspp. I want to know how the messages are being posted. I installed fiddler and enabled https and tweaked the certificates settings in it. I am unable to get any traffic from web.whatsapp.com, but fiddler is able to capture requests and responses of other websites(http, https). Please help.
I have a PowerShell script that uploads a batch of files to lingq.com.
I created it the following way: I logged in to the site via browser, and made an upload manually through the web page. I grabbed the request in Fiddler, then duplicated it in PowerShell, including the authentication cookies. I'd just swap out the content of the request and send it. It wasn't pretty, but it worked and saved me an immense amount of time. The only downside was every time I had to log in to the site again, my authentication cookies got invalidated and I had to grab them again. But that I could live with.
They seem to have changed all their communication to https, because now instead of a request to
http://www.lingq.com/learn/ja/import/contents/?add
all I see in Fiddler is
"Tunnel to www.lingq.com/443"
Fiddler also gives me a warning that HTTPS decryption is disabled. When I enable it, and start capturing, Firefox gives me a certificate error when I try to access the site (or any other site that uses certificates, including Google):
www.lingq.com uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)
My script is now completely useless, every request I send returns the login page. And because of Fiddler messing up the certificates, I can't further reverse engineer the site to mimic the requests correctly.
How can I make https decryption work in Fiddler? Alternatively, is there a way my script can properly authenticate itself on the site? I have tried the steps described here:
How to make an authenticated web request in Powershell?
It didn't work at all. My guess is some sort of federated authentication is in place, but frankly I'm completely out of my depth here.