There are various UI automation tools to automate your website
and validate the UI. However, it’s also important to capture and validate the
network traffic. This can be done using FiddlerCore. You can also perform
various types of testing like low bandwidth testing, mobile device testing and localization
testing using FiddlerCore.
To start FiddlerApplication, call FiddlerApplication.Startup(0, FiddlerCoreStartupFlags.Default);
Enable HTTPS Decryption
You can enable HTTPS Decryption while starting
Fiddler Application
FiddlerApplication.Startup(0,
FiddlerCoreStartupFlags.DecryptSSL);
You also need to create and import Root cert for
Fiddler
if
(!CertMaker.rootCertExists())
{
if (!CertMaker.createRootCert())
{
throw new Exception("Unable to create cert for FiddlerCore.");
}
}
X509Certificate2
oRootCert = CertMaker.GetRootCertificate();
X509Store
certStore = new X509Store(StoreName.Root, StoreLocation.LocalMachine);
certStore.Open(OpenFlags.ReadWrite);
try
{
certStore.Add(oRootCert);
}
finally
{
certStore.Close();
}
Capture Network Traffic
You can capture the network traffic in a list and then
perform various validations like checking for response time, response string, etc.
for the captured sessions.
List<Session> _sessions
= new List<Session>();
FiddlerApplication.BeforeRequest += delegate(Session
oSession)
{
Monitor.Enter(_sessions);
_sessions.Add(oSession);
Monitor.Exit(_sessions);
};
Simulate Modem Speeds
You can add a delay of specific milliseconds per KB uploaded
as well as for per KB downloaded. This simulates a slow network and can be used
to test scenarios where specific requests shouldn’t be made on a slow network. For
example, Yahoo mail downloads an image on good network but doesn’t on a slow
network.
High Bandwidth
Low Bandwidth
FiddlerApplication.BeforeRequest += delegate(Session
oSession)
{
if (!_applyrule) return;
oSession["request-trickle-delay"]
= sendDelayinMillisecPerKb;
oSession["response-trickle-delay"]
= receiveDelayinMillisecPerKb;
};
Mobile Device Testing
Most websites rely on
the User Agent string to determine if a request is coming from a mobile device.
Hence to test the behavior of a website on a mobile device, corresponding User
Agent is set using the Fiddler proxy. For example, when you send the user agent
for WP 7.5 i.e. Mozilla/5.0 (compatible;
MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0; Microsoft;
XDeviceEmulator) , Gmail looks different than that on IE 9
Internet Explorer
9
Windows Phone 7.5
FiddlerApplication.BeforeRequest += delegate(Session
oSession)
{
if (_applyrule)
{
oSession.oRequest["User-Agent"]
= userAgent;
}
};
Localization Testing
Localization testing can be performed by requesting the
content in a specific language. This is done by modifying the Accept-Language
header using the Fiddler proxy. For example, Hotmail looks the opposite for
English and Hebrew Language.
English (en-US)
Hebrew (he)
FiddlerApplication.BeforeRequest += delegate(Session oSession)
{
if (_applyrule)
{
oSession.oRequest["Accept-Language"]
= languageAbbreviation;
}
};
