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Hello, I am using Delphi 10.3.3, targeting Win32 executable. There is a SOAP web service that I have build a class for it. That class runs just fine on a test project. However, when I put it in my main project, I get below error DocumentElement http://schemas.xmlsoap.org/soap/envelope/:Envelope expected, :Envelope found I checked, there is only one single unit for this web service in my whole computer and both projects are using that unit. I have used different SOAP web services in the past. Some of them rarely raise "HTML found" kind of error messages, but never got ":Envelope found" until now. None of my web searches lead me to same error message that I receive. I have all requests and responses saved in text files. Comparing them I can see no difference. It is only number of records returned changes due to filter parameters. I also used Fiddler Telerik and captured whole response using both test project and main project. They are identical as far as I can tell. Test project response starts as: HTTP/1.1 200 OK Content-Type: text/xml;charset=UTF-8 Connection: keep-alive Set-Cookie: JSESSIONIDSSO=529DA436282217EF9D8D9F21515121D3; Path=/; Secure Set-Cookie: JSESSIONID=82E5260FE1737AA7C77DCE37D71B7132; Path=/listingapi/ws; Secure Server-Timing: intid;desc=d2369e80a9274e5b Date: Sun, 06 Jun 2021 19:41:44 GMT Vary: Accept-Encoding Content-Length: 15213 <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'> <env:Header/> <env:Body> <ns1:getSalesByDateRangeResponse xmlns:ns1='http://sale.individual.ws.listingapi.gg.com'> <return> <ackCode>success</ackCode> <responseTime>06/06/2021 22:41:44</responseTime> <timeElapsed>1 ms</timeElapsed> <saleCount>11</saleCount> <sales> <sale> Main project response starts as: HTTP/1.1 200 OK Content-Type: text/xml;charset=UTF-8 Connection: keep-alive Set-Cookie: JSESSIONIDSSO=7A2E4B6940B5E0E44F86FF95BBCD6C3D; Path=/; Secure Set-Cookie: JSESSIONID=0ED54949FAC10990F8F24B27B9174216; Path=/listingapi/ws; Secure Server-Timing: intid;desc=1a968daea7e9c9d9 Date: Sun, 06 Jun 2021 19:41:17 GMT Vary: Accept-Encoding Content-Length: 9877 <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'> <env:Header/> <env:Body> <ns1:getSalesByDateRangeResponse xmlns:ns1='http://sale.individual.ws.listingapi.gg.com'> <return> <ackCode>success</ackCode> <responseTime>06/06/2021 22:41:17</responseTime> <timeElapsed>225 ms</timeElapsed> <saleCount>7</saleCount> <sales> <sale> Web service WSDL can be reached from: https://dev.gittigidiyor.com:8443/listingapi/ws/IndividualSaleService?wsdl I appreciate any help, please. Thanks & Regards, Ertan