C# error in application

Question

I implemented my site and suddenly im catching an error in the global.asax application_error which states the following:

Error Caught in Application_Error event Error in: http://www.mydomain.com/styles/data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs= Error Message:A potentially dangerous Request.Path value was detected from the client (:).
SOURCE: System.Web FORM:  QUERYSTRING:  TARGETSITE: Void ValidateInputIfRequiredByConfig() STACKTRACE:    at
System.Web.HttpRequest.ValidateInputIfRequiredByConfig()     
at System.Web.HttpApplication.ValidateRequestExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()     at 
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

I know this is the data for an image , but i cant find out how and why this is happen.
Any ideas?

Chr.

Kirk Woll · Accepted Answer · 2011-09-29 06:14:18Z

5

It's an illegal URL:

http://www.mydomain.com/styles/data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs

The colon is a special character (signifiying protocol separator, port separator, or password separator)

As Hasan mentions, you can turn this validation off. But in truth, you should avoid having URLs like this that are just just completely invalid. Instead, URL-encode it (the part after "data").

answered Sep 29, 2011 at 6:14

Kirk Woll

77.8k23 gold badges189 silver badges200 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Eriawan Kusumawardhono Over a year ago

This is the best answer! The asker should mark this answer as answer.

Community · Accepted Answer · 2017-05-23 11:49:30Z

1

It could be caused by a CSS minifier tool incorrectly altering data:image URLs: Why would CSS data-URIs be logged as 404 requests?

edited May 23, 2017 at 11:49

CommunityBot

11 silver badge

answered Mar 14, 2014 at 20:03

Mike Asdf

2,3391 gold badge27 silver badges34 bronze badges

Collectives™ on Stack Overflow

C# error in application

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related