A better message for an "Invalid request line"

[Gary Gregory]

Hi All:

I am debugging a use case where my HTTP server receives junk it seems:

org.apache.http.ProtocolException: Invalid request line:  4 ւ
HTTP/1.1   /logon   137.134.250.10 󿠘rsmob.rocketsoftware.com  ہ         
application/json
cache-control   no-cache
Postman-Token  $8c44259f-5e7c-47eb-ba73-2146e791b82f
PostmanRuntime/7.1.1    */*    rsmob.rocketsoftware.com
gzip, deflate    44
        at 
org.apache.http.impl.nio.codecs.AbstractMessageParser.parse(AbstractMessageParser.java:209)
~[httpcore-nio-4.4.9.jar:4.4.9]

The square boxes I am seeing are not really helpful. I wonder if we should
replace non-printable characters with a hex string like "0x00", "0x01", and
so on. Or "\u0000", "\u0001".

This might be more helpful than asking customer to record traffic in
Wireshark or to re-run with debug logging.

Thoughts?

Gary