Invalid character in a Base-64 string. ASP .NET with Jmeter

0
votes

I am trying to record Jmeter scripts against some ASP .NET application. (this application is owned by some xyz company) . The app works fine when I run it without Jmeter. As soon as I start Jmeter proxy and start recording the app dies on second page ...

Here is the exception I see on the browser. Also its https enabled so made sure the certs are present in proxyserver.jks under apache bin directory.

Invalid character in a Base-64 string.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: Invalid character in a Base-64 string.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[FormatException: Invalid character in a Base-64 string.]
System.Convert.FromBase64String(String s) +0 FirstAppBusinessLogic.DynamicPages.UrlEncryption.Decrypt(String inputText) +57 QueryStringHttpModule.context_BeginRequest(Object sender, EventArgs e) +246
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

I see a similar post here ASP.NET Invalid character in a Base-64 string

But in my case it happens only when I try to record using Jmeter. Normally with out Jmeter proxy everything seems fine.

Any help ?

-Ram

1
asp.net-mvc-3base64jmeter
Off-topic: I wouldn't have called a class dealing with base64 UrlEncryption. The Encryption part of the name is kinda bothering me. Besides this, there's too little context in your question to diagnose this problem. – Darin Dimitrov
Hi Darin, Thanks for your comment. This code is written by some third party. All I am trying to do is access there URL (Web app) and want to make sure there web app can serve the load. So I was trying to record Jmeter scripts for this app to do some load testing. – Reddymails
This also has absolutely nothing to do with asp-classic. I don't know how many times I have to say this! Please learn the difference. – Paul
Paul, My question is related to the app not working when I use Jmeter proxy. So how is this related to your comment saying "I don't know how many times I have to say this! Please learn the difference between Classic ASP vs ASP .NET". I feel your comment is out of context. Sorry. – Reddymails
What requests is jmeter making and how are they encoded? Jmeter will only encode if you tell it to. – CharlieS

1 Answers

0
votes

Thank your for all your inputs. After troubleshooting further I noticed that there was query parameter in url with value "==".

Since "==" is not one of the value you can send unless its urlencoded this was breaking the flow. Asked the other team to urlencode all query params and the issue was resolved.