HTTP - Fiddler


Fiddler 1) is a HTTP Network Analyzer via a forward proxy

How it works

It will install itself as the system HTTP Forward proxy.

How to capture traffic?

from browser

Browsers support the system proxy (ie windows configuration). You have nothing to do to see and capture the request made by browsers.

from your application

You need to configure the proxy to point to Fiddler

Example Java:

  • On the HTTP library
ProxyOptions fiddler = new ProxyOptions();
RequestOptions clientRequestOptions = new RequestOptions()
System.setProperty("http.proxyHost", "");
System.setProperty("https.proxyHost", "");
System.setProperty("http.proxyPort", "8888");
System.setProperty("https.proxyPort", "8888");
// For the seamless experience in Windows you may consider adding


Fiddler Web Debugger



  • Why ? The issued certificate has expired
  • Solutions: You need to reset all certificates. Go to Tools > Options > HTTPS > Actions > Reset All Certificates

No traffic captured: Filters?

Be sure that there is no filter in the bottom left corner. If this is the case, a right click will delete it

Discover More
Chrome Devtool Network
HTTP - Diagnostic

To see the HTTP request, you may use the following HTTP client: a Browser Development tool (specifically the network tab) or any network sniffer See
Chrome Devtool Har

An HTTP Archive JSON (HAR) is an archive that contains HTTP requests. with an headless browser. Example with pupetteer or manually. Example in Google...
Map Of Internet 1973
Network - Trace (Capture|Sniffer|Analyzer) Tool (Packet Analysis)

Network Sniffer records network data unit (ie packet or message) The record can be done by: sniffing SNMP, WMI, proxy or local agents Packet analysis: After being captured, a packet...
Map Of Internet 1973
What is Wireshark? known also as Ethereal

Wireshark is a network sniffer that captures ethernet frames Wireshark uses the library WinPcap to capture live network data on Windows. It can reassemble IP packet...

Share this page:
Follow us:
Task Runner