Problems with XML Encoding When Sending SOAP Requests in C# - Character Encoding Issues
I'm trying to debug I'm following best practices but I tried several approaches but none seem to work. I've looked through the documentation and I'm still confused about I'm currently working with an scenario while sending SOAP requests using C# where the XML encoding seems to be causing trouble. Specifically, I need to send a request that includes special characters like `&`, `<`, and `>` in the XML body. However, when I send the request, I'm getting a 400 Bad Request behavior from the server, and the behavior message states: `Malformed XML: Invalid character in entity`. I am using the `HttpClient` class for making the SOAP call, and I have manually encoded the special characters using `System.Security.SecurityElement.Escape()`. Here's the snippet of the code I am using to prepare the request: ```csharp string soapEnvelope = $"<?xml version='1.0' encoding='utf-8'?>\n" + $"<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>\n" + $" <soap:Body>\n" + $" <MyRequest>\n" + $" <Data>{System.Security.SecurityElement.Escape(data)}</Data>\n" + $" </MyRequest>\n" + $" </soap:Body>\n" + $"</soap:Envelope>"; var httpClient = new HttpClient(); var requestContent = new StringContent(soapEnvelope, Encoding.UTF8, "text/xml"); var response = await httpClient.PostAsync(endpointUrl, requestContent); ``` Despite escaping the characters, I'm still working with the same behavior. I've also tried using `System.Xml.Linq.XElement` to build the XML instead, but the result is the same. Here’s an example of how I attempted this: ```csharp var xdoc = new XDocument( new XElement("soap:Envelope", new XElement("soap:Body", new XElement("MyRequest", new XElement("Data", data) ) ) ) ); ``` In this case, I didn’t use `Escape`, but I still received the same 400 behavior. I have verified that the web service I am calling expects UTF-8 encoding, and my request body is set to use that encoding as well. Is there something I'm missing with the way I construct my XML for the SOAP request, or is there an alternative approach that I should be considering? Any guidance would be appreciated! I'm working on a web app that needs to handle this. Thanks in advance! This is part of a larger API I'm building. Any ideas what could be causing this? My development environment is Ubuntu 22.04. Any ideas how to fix this? I'm on Windows 10 using the latest version of Csharp.