HttpException Server cannot append header after HTTP headers have been sent

[CSharpDude]

Hi -

We are using the URL rewrite module to handle redirects from multiple old sites that now point to the new Sitecore site. The one issue we see is the logs have a lot of "_HttpException Server cannot append header after HTTP headers have been sen_t" errors. Has this been seen before or do we have something misconfigured perhaps?

Thanks,

Dave

[iamandycohen]

What version are you using?

…

On Wed, May 10, 2017, 9:45 AM CSharpDude ***@***.***> wrote: Hi - We are using the URL rewrite module to handle redirects from multiple old sites that now point to the new Sitecore site. The one issue we see is the logs have a lot of "_HttpException Server cannot append header after HTTP headers have been sen_t" errors. Has this been seen before or do we have something misconfigured perhaps? Thanks, Dave — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#33>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAxmf24A8YX2NuiME2oVhmQKndOKMmdqks5r4c2QgaJpZM4NWxb_> .

[CSharpDude]

We are using 1.8.1.3.

Sample from the Sitecore log:
3472 18:43:51 INFO UrlRewrite[web]::Redirecting http://www.academyofarthroscopy.com/gastroenterology-pulmonology/guide-wires.aspx to http://www.conmed.com/ [301]
3472 18:43:51 ERROR Application error.
Exception: System.Web.HttpException
Message: Server cannot append header after HTTP headers have been sent.
Source: System.Web
at System.Web.HttpHeaderCollection.SetHeader(String name, String value, Boolean replace)
at Sitecore.Web.XFrameOptionsHeaderModule.EndRequestHandler(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Thanks,

Dave