My .asmx web service is compatible with the Visual Studio test page .asmx, but unfortunately, it sends a 500 error code back to the client

I am new to this and facing an issue with my web service .asmx. It is working fine with the Visual Studio test page .asmx, but it returns a 500 error to the client.

The problem arises when I include HTML in the payload from the client, causing the server to fail. Interestingly, the Visual Studio test page works seamlessly with HTML. Any suggestions or assistance would be greatly appreciated. Thank you!

Web Service
.asmx 
[WebMethod, ValidateInput(false)]
        public string HelloWorld(string input)
        {
            return "Hello World";
        }

Server web.config
<system.web>
    <compilation debug="true" targetFramework="4.6.1"/>

    <httpRuntime requestValidationMode="2.0"/>
    <pages validateRequest="false" 
controlRenderingCompatibilityVersion="4.0"/>

  </system.web>

     ajax
     $.ajax({  
         type: "POST",  
         url: "http://localhost:62093/tMt_webService1In.asmx/HelloWorld",  

         data: "{ 'mail': '" + bodyout + "' }",
         contentType: "application/json; charset=utf-8",

         datatype: "json",
         success: function(responseFromServer) {  
                    alert(responseFromServer.d)  
                },
         error: function(responseFromServer) {  
                    alert("error " + responseFromServer.lastError)  
                }  
       });

Answer №1

To ensure the security of your request, it is important to escape any HTML before sending it to the server. Certain characters like > or < can be rejected by the server for safety measures. This may not be an issue when testing locally, but it is crucial for live deployments.

A simple JavaScript method can help strip out these unwanted characters. Here is an example:

function escapeHtml (string) {
    return String(string).replace(/[&<>"'`=\/]/g, function (s) {
         return entityMap[s];
    });
 }

When transmitting the data, make sure to apply this method:

 data: "{ 'mail': '" + escapeHtml(bodyout) + "' }",

Upon receiving the data on the server side, you can decode it back to HTML using a tool like HttpUtility.HtmlDecode.

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