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          Returns true if the message
          semantics require an end of file.
        
bool need_eof() const;
          For HTTP requests, this function returns the logical NOT of a call to
          keep_alive. For HTTP responses,
          this function returns the logical NOT of a call to keep_alive if any of the following
          are true:
        
has_content_length would return
              true
            chunked would return true
            result returns status::no_content
            result returns status::not_modified
            result returns any informational
              status class (100 to 199)
            
          Otherwise, the function returns true.