I try to use call credentials to verify the request sanity:

  In the client, 
         serialize the request to string,
         sign the string,
         and send the signature as metadata.
  In the server, 
        serialize the request to string,
        sign the string,
        sign the request,
        and compare the signature to the one in metadata.

  It works perfect until I met a message with a map. Protobuf 
 serialization doesn't guarantee the order of map items. 

  How could I get original serialization string of the request in the 
server side using python API?


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