![]() AfterSessionComplete is the last event that fires in the request sequence and it’s the most common choice to capture all request and response data. In my case I want to capture the request data and I actually have several options to capture this data. Other events include BeforeRequest, BeforeResponse, RequestHeadersAvailable, ResponseHeadersAvailable and so on. Here I only hook up to the AfterSessionComplete event but there are a number of other events that hook various stages of the HTTP request cycle you can also hook into. The key lines for FiddlerCore are just the last two lines of code that include the event hookup code as well as the Startup() method call. ![]() AfterSessionComplete += FiddlerApplication_AfterSessionComplete įiddlerApplication. ![]() TryParse(strProcId, out procId))ĬaptureConfiguration.CaptureDomain = txtCaptureDomain.Text įiddlerApplication. StrProcId = strProcId.Substring(strProcId.IndexOf( '-' ) + 1).Trim() Once these options are set, I hook up the AfterSessionComplete event to capture every URL that passes through the proxy after the request is completed and start up the Proxy service: void Start()ĬaptureConfiguration.IgnoreResources = true ĬaptureConfiguration.IgnoreResources = false In the live application these settings are persisted configuration values, but in the demo they are one time values initialized and set on the form. In the following code directly lifted from WebSurge, I configure a few filter options on Form level object, from the user inputs shown on the form by assigning it to a capture options object. Fiddler includes a number of static class methods on the FiddlerApplication object that can be called to hook up callback events as well as actual start monitoring HTTP URLs. Once the library is installed it’s super easy to hook up Fiddler functionality. I’ll have more on SSL captures and certificate installation later in this post.īut first let’s see how easy it is to use FiddlerCore to capture HTTP content by looking at how to build the above capture form. The library consists of the FiddlerCore.dll as well as a couple of support libraries ( CertMaker.dll and BCMakeCert.dll) that are used for installing SSL certificates. You can download it from the Telerik site and manually add the assemblies to your project, or you can simply install the NuGet package via: Integrating FiddlerCoreįiddlerCore is a library that simply plugs into your application. ![]() Note that FiddlerCore is bound by a license for commercial usage – see license.txt in the FiddlerCore distribution for details. West Wind Web Surge (example implementation in live app).Show me the Code (WebSurge Integration code from GitHub). ![]() If you want to jump right in here are the links to get Telerik’s Fiddler Core and the code for the demo provided here. In this post I’m going to demonstrate how easy it is to use FiddlerCore to build this HTTP Capture Form. The result of what I ended up creating is this semi-generic capture form: FiddlerCore makes it almost too easy to capture HTTP content!įor WebSurge I needed to capture all HTTP traffic in order to capture the full HTTP request – URL, headers and any content posted by the client. To make this happen, I used Eric Lawrence’s awesome FiddlerCore library, which provides most of the functionality of his desktop Fiddler application, all rolled into an easy to use library that you can plug into your own applications. One of the options in WebSurge for capturing URLs is to use its built-in capture tool which acts as an HTTP proxy to capture any HTTP and HTTPS traffic from most Windows HTTP clients, including Web Browsers as well as standalone Windows applications and services. One of the key components of a load testing tool is the ability to capture URLs effectively so that you can play them back later under load. Over the last few weeks I’ve been working on my Web load testing utility West Wind WebSurge. ![]()
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