gistfile1.cs

private static string Format(Exception ex)
{
    if (ex == null)
        throw new ArgumentNullException("ex");

    var baseException = ex.GetBaseException();

    var builder = new StringBuilder();
    builder
        .AppendLine()
        .AppendFormat("Exception type: {0}", baseException.GetType().FullName).AppendLine()
        .AppendFormat("Message: {0}", baseException.Message).AppendLine()
        .AppendFormat("StackTrace: {0}", baseException.StackTrace).AppendLine();

    if (HttpContext.Current != null)
    {
        var request = TryGetRequest();

        if (request != null)
        {
            builder
                .AppendFormat("URL: {0}", request.RawUrl).AppendLine()
                .AppendFormat("ContentType : {0}", request.ContentType).AppendLine()
                .AppendFormat("HttpMethod: {0}", request.HttpMethod).AppendLine()
                .AppendFormat("Headers: {0}", request.Headers.ToFormattedString()).AppendLine()
                .AppendFormat("Form: {0}", request.Form.ToFormattedString()).AppendLine()
                .AppendFormat("QueryString: {0}", request.QueryString.ToFormattedString()).AppendLine()
                .AppendFormat("InputStream: {0}", request.ToFormattedInputString());
        }
    }

    return builder.ToString();
}

private static HttpRequest TryGetRequest()
{
    try
    {
        // It might throw the following exception if the Request is not available
        // HttpException (0x80004005): Request is not available in this context
        return HttpContext.Current.Request;
    }
    catch (HttpException)
    {
        return null;
    }
}

private static string ToFormattedString(this System.Collections.Specialized.NameValueCollection collection)
{
    var sb = new StringBuilder();
    foreach (var key in collection.AllKeys)
    {
        sb.AppendFormat("\t\t{0}={1}", key, collection[key]).AppendLine();
    }

    return sb.ToString();
}

private static string ToFormattedInputString(this HttpRequest request)
{
    var result = "";
    using (var reader = new BinaryReader(request.InputStream))
    {
        request.InputStream.Position = 0;
        var bytes = reader.ReadBytes((int)request.InputStream.Length);
        result = request.ContentEncoding.GetString(bytes);
    }

    return result;
}