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[.NET Core] ASP.NET Core exception Headers are read-only, response has already started

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Posted on 7/11/2024 9:44:40 AM | | | |
Requirements: ASP.NET Core modifies the response header Server information in the middleware, error: System.InvalidOperationException: Headers are read-only, response has already started.

Misspelling:

The error is as follows:

fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HN519819L24M", Request id "0HN519819L24M:00000001": An unhandled exception was thrown by the application.
      System.InvalidOperationException: Headers are read-only, response has already started.
         at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpHeaders.ThrowHeadersReadOnlyException()
         at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseHeaders.Microsoft.AspNetCore.Http.IHeaderDictionary.set_Server(StringValues value)


The cause of the anomaly is becauseWhen the ASP.NET Core has already started responding, the Headers are not allowed to be modified again, that is, when the response starts, the headers will become read-only.

The solution is as follows:



As shown below:





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