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namespace System.Web.Mvc {
using System;
public static class HttpRequestExtensions {
internal const string XHttpMethodOverrideKey = "X-HTTP-Method-Override";
public static string GetHttpMethodOverride(this HttpRequestBase request) {
if (request == null) {
throw new ArgumentNullException("request");
}
string incomingVerb = request.HttpMethod;
if (!String.Equals(incomingVerb, "POST", StringComparison.OrdinalIgnoreCase)) {
return incomingVerb;
}
string verbOverride = null;
string headerOverrideValue = request.Headers[XHttpMethodOverrideKey];
if (!String.IsNullOrEmpty(headerOverrideValue)) {
verbOverride = headerOverrideValue;
}
else {
string formOverrideValue = request.Form[XHttpMethodOverrideKey];
if (!String.IsNullOrEmpty(formOverrideValue)) {
verbOverride = formOverrideValue;
}
else {
string queryStringOverrideValue = request.QueryString[XHttpMethodOverrideKey];
if (!String.IsNullOrEmpty(queryStringOverrideValue)) {
verbOverride = queryStringOverrideValue;
}
}
}
if (verbOverride != null) {
if (!String.Equals(verbOverride, "GET", StringComparison.OrdinalIgnoreCase) &&
!String.Equals(verbOverride, "POST", StringComparison.OrdinalIgnoreCase)) {
incomingVerb = verbOverride;
}
}
return incomingVerb;
}
}
}
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