https://bz.apache.org/bugzilla/show_bug.cgi?id=69031

            Bug ID: 69031
           Summary: Not Implemented 501 by truncated method name
           Product: Tomcat 9
           Version: 9.0.86
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Servlet
          Assignee: dev@tomcat.apache.org
          Reporter: musc...@araneolus.net
  Target Milestone: -----

There is a problem in tomcat, but unfortunately I don't know exactly where the
problem occurs. Whether the connector or the web servlet is responsible.
I am calling many different POST, GET and DELETE requests in parallel using
httpclient 5.3.1. In some cases a 501 (Not Implemented) code is returned.

10.81.234.21 - - [21/May/2024:14:59:42 +0000] "ST /rest/api/v1/content
HTTP/1.1" 501 727

The first two letters of the rest metode are always missing, or the method is
completely empty.
I have recorded the network traffic with tcpdump and seen in wireshark that a
"POST","GET","PUT" or "DELETE" arrives at tomcat from the client.
In the tomcat request dump filter, however, the method is shown as  
 method=ST instead of method=POST
I therefore assume that the method name is garbled before the filter.
This occurs once with approx. 5000 calls and only if the calls are sent to the
tomcat in parallel at short intervals.

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