Description
Component
OpenTelemetry.Instrumentation.Wcf
Package Version
| Package Name | Version |
|---|---|
| OpenTelemetry.Instrumentation.AspNet | 1.9.0-beta.1 |
| OpenTelemetry.Instrumentation.Wcf | 1.0.0-rc.17 |
Runtime Version
net48
Description
HttpRequest.Headers becomes read-only when OpenTelemetry packages are installed.
By default, System.Web does not make headers read-only for IIS7 requests, but AspNetParentSpanCorrector always makes it read-only
Steps to Reproduce
// global.asax.cs
protected void Application_BeginRequest(object sender, EventArgs e)
{
Request.Headers.Set("MyExtraHeader", "hello-world");
}Expected Result
Header added successfully when application is hosted in IIS
Actual Result
Collection is read-only.
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.NotSupportedException: Collection is read-only.
Additional Context
Seems to be introduced in this commit. Should probably check if the headers collection is already modifiable and take no action in such case, returning to the current behavior otherwise.