Event ID - 52

Event Id52
SourceMicrosoft-Windows-HttpEvent
DescriptionParsing of request (request ID %2) failed due to reason: %3. Request may not be compliant with HTTP/1.1.
Event InformationAccording to Microsoft :
Cause
This event is logged when parsing of request failed due to reason.Request may not be compliant with HTTP/1.1.
Resolution
Modify client application to be compliant with HTTP/1.1
With a parsing failure, the client application might not be sending an HTTP/1.1-compliant HTTP request. For example, a parsing failure might result from a client application sending an HTTP request that lacks a HostHeader. The client application should be modified to send a compliant HTTP request.
Verify
If parsing has failed because of a 4xx error, there will be a ParseRequestFailed error in your HTTPERR log at the following directory:
%Windir%\System32\Logfiles\HTTPERR
If there is no ParseRequestFailed error present, the parser has not failed.
Reference LinksEvent ID 52 from Source Microsoft-Windows-HttpEvent

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