Generic handler parameter size limit?

Question

I have some JavaScript code which generates a very long script and than posts it back to the server to a generic handler for creating a csv.

My JavaScript Code for sending the data is:

function postwith(to, p) {
var myForm = document.createElement("form");
myForm.method = "post";
myForm.action = to;
for (var k in p) {
    var myInput = document.createElement("input");
    myInput.setAttribute("name", k);
    myInput.setAttribute("value", p[k]);
    console.log(k+":"+p[k]);
    myForm.appendChild(myInput);
}
document.body.appendChild(myForm);
myForm.submit();
document.body.removeChild(myForm);

}

In my console I can see that the entire string is added to the form ("console.log(k+':'+p[k]);" so the client side seems to work ok.

In the network view where I examine the request/response I can see that "Content" (the name of the form data attribute) is not complete - it is cut in the middle.

The server side is very simple - sends back the content as csv:

public class Excel : IHttpHandler {

public void ProcessRequest (HttpContext context) {

    context.Response.ContentType = "text/csv";
    context.Response.AddHeader("Content-Disposition", "attachment; filename=" + context.Request["Report"] +System.DateTime.Now.Ticks+ ".csv");
    string content = context.Request["Content"];
    content = content.Replace(";", System.Environment.NewLine);
    System.Text.UTF8Encoding uc = new System.Text.UTF8Encoding(true);
    context.Response.Output.WriteLine(content);
    context.Response.End(); 
}

public bool IsReusable {
    get {
        return false;
    }
}

}

MY guess is the server needs to be configured somehow to allow larger posts...

Answer 1

You can set the maximum allowed content length in the web.config. The default value is 30,000,000 bytes:

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="[maxLengthInBytes]" />
    </requestFiltering>
  </security>
  ...
</system.webServer>