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SOAP and REST – Using GZip with Delphi client

Discussion in 'Delphi Programming' started by AdminDF, Apr 7, 2014.

  1. AdminDF
    Online

    AdminDFAdminDF is a Verified Member Delphifan Staff Member DF Staff

    We are deciding between SOAP and REST. I’ve implemented client applications in Delphi using GZip. It is a very simple implementation and it brings a great result. The larger the volume of data, greater the difference using GZip compression. The bandwidth is also a factor that influences a lot.  Let’s see the implementations.

    REST with GZIP

    Implementation of compression with REST is extremely simple. It’s just a matter of correctly setting the “Compressor” attribute of the  TIDHttp component. I’m using TIdCompressorZLib.

    Code:
    IdHttp := TIdHTTP.Create(nil);
    IdHttp.Compressor := TIdCompressorZLib.Create(IdHttp);

    NOTE: This does not work in Delphi XE2. Access violation occurs. Works in XE3.

    SOAP with GZIP

    Implementation with SOAP is a bit more complicated. For my tests I used the THTTPrio component events.

    Code:
    procedure HTTPRIOHTTPWebNode1BeforePost(const HTTPReqResp: THTTPReqResp; 
      Data: Pointer);
    const
      INTERNET_OPTION_HTTP_DECODING = 65;
      contentEncodingHeader = 'Accept-Encoding: gzip, deflate';
    var
      Flag: LongBool;
    begin
      Flag := True;
      HttpAddRequestHeaders(Data, PChar(contentEncodingHeader), 
        Length(contentEncodingHeader), HTTP_ADDREQ_FLAG_ADD);
      InternetSetOption(Data, INTERNET_OPTION_HTTP_DECODING, 
        PChar(@Flag), SizeOf(Flag));
    end;

    Benchmarks

    These tests were done in order to compare the implementation of SOAP and REST.  I used the framework developed by a brazilian programmer, Fabricio Colombo, the Delphi REST Client API. Tests were performed with a bandwidth limited to 512 Kbps. Information is in milliseconds.

    [​IMG]

    [​IMG]

    The difference with GZip is big. Do not be fooled by the chart! It’s a logarithmic scale.
     

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