Creating Dynamic Http Response From Component
May 14, 2010
I've developed a component which processes online payments. At a specific point the user must be redirected to the selected acquirer web site for authentication. The acquirer itself suggests that there should be a web page which does it. Something such as the following,
<!--TakeOff.aspx-->
<html xmlns="[URL]">
<head id="Head1" runat="server">
<title>@</title>
<script type="text/javascript">
function Go() {
form1.submit();
}
</script>
</head>
<body onload="Go();">
<form id="form1" runat="server" method="post" action="/...">
<div>
<asp:HiddenField ID="MID" runat="server" />
<asp:HiddenField ID="Amount" runat="server" />
<asp:HiddenField ID="ResNum" runat="server" />
<asp:HiddenField ID="RedirectURL" runat="server" />
</div>
</form>
</body>
</html>
This page redirects the user and posts required arguments to the acquirer's web site. Prior to this page there is another page with a payment button (for example). In the click event of the payment button my component is instantiated and required calculation is done. Something such as the following,
protected void btnPayment_Click(object sender, EventArgs e)
{
try
{
var paymentProcessor = new NS.PaymentProcessor(/*required arguments*/);
/*...*/
NS.Result result = paymentProcessor.Calc();
Session.Add("PaymentProcessResult", result);
Response.Redirect("TakeOff.aspx");
}
catch (Exception p)
{
throw p;
}
}
What I'm going to do is to generate [TakeOff.aspx] page at run-time by the payment processor component instead of having static page (I mean aspx pages that are generated during development phase). The reason why is that we may have different acquirers and each acquirer requires its own arguments to be posted. So if the payment processor component generates aspx or even html pages at run-time we do not need recompile and redeploy the web application.
My problem is that I do not know how to generate aspx pages at run-time. I'm not an ASP.NET guru and all efforts that I've made using HttpResponse were in vain as the original page does not transfer the control to the generated page.
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[Code] ...
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im working with a 3rd party on a project, we are going to pass them up to 3 values via a querystring and they are going to return 2 values that i need within a http response.
I found a few example here and just using google but they all varied of course due to the individual requirements in those examples..
what im looking for is a example that can get me started on how to send them the values during a button click on my page, wait for a response from them, then read the 2 values returned and continue with my button event which will involve passing the values to our stored procedure.
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Is it possible to cache the response of a http handler on the server and on the client?This doesn't seem to be doing the trick:
_context.Response.Cache.SetCacheability(HttpCacheability.Public);
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Jan 5, 2011
my current question is tightly related to this one, but is far more specific. We have to plan a design strategy for the objective described in that question. We want to do this by rewriting HTML on ASP.NET web forms. My question is: which strategy is the best according to parameters of feasibility, performance impact and implementation effort on legacy applications.
what I have to do is to basically get the HTML output of a Web Form, parse it, and replace certain URLs according to user-defined rules. In that example, I would rewrite all static content to CDN URLs, but it can be easily extended to URL rewriting techniques. I found lots (and I really mean lots) of articles about URL rewriting from the perspective of having URLs like [URL]interpreted as [URL] but I found none showing me how to smartly format old-style URLs to shorter format right from inside HTML (so the page will render the short-form URL directly) [edit] without deep code intervention.
Strategy 1
Like suggested in an answer of the above question, write an HTTP Module that intercepts the HTML and rewrites it. Actually, I looked around and saw I can set a Response.Filter stream object that performs the HTML filtering.
Pros:
I can inject the HTTP Module on a legacy application, configure rewriting rules via XML and have the oldest CRM/ecommerce application load static content from a CDN without touching its code at all.
Cons:
I suspected that (and a comment here confirms my suspects) having to reimplement a Stream's Write method, which operates on a partial buffer in the general case, can result in bad replacements. Suppose the Write method is first called with a chunk like [URL] (where I assume <img src="h was already written before) and later ge.png" /> (so guess the final URL :-P) with a rewrite rule that regexes [URL][^"]* into [URL] the substitution is not done. To workaround that, I could use a MemoryStream or something like that to buffer the complete set of data and then perform the substitutions, but it could cause troubles on highly loaded servers
Strategy 2
Overriding Page's Render method in a way such as described here
Pros:
doesn't suffer the chunking problem
Cons:
requires defining a base class for all pages. Feasible on new applications, not sure for maintaining legacy applications. Seems has a problem as you cannot instantiate HttpTextWriter directly Obviously, for the new webapps we'll have to develop, I would adopt strategy 2, but I really like using dynamic components a lot, as they can be plugged with ease when application requires them (so if our new app will be installed without a CDN the feature is turned off).
Briefly, my questions are How would you fix both strategies' cons (particularly 1st)? And, of course, do you have other strategies to suggest to achieve this objective?
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First of all, quickly what exactly I want to achieve: translate particular exception into the HTTP 404 so the ASP.NET can handle it further. I am handling exceptions in the ASP.NET (MVC2) this way:
protected void Application_Error(object sender, EventArgs e) {
var err = Server.GetLastError();
if (err == null)
return;
err = err.GetBaseException();
var noObject = err as ObjectNotFoundException;
if (noObject != null)
HandleObjectNotFound();
var handled = noObject != null;
if (!handled)
Logger.Fatal("Unhandled exception has occured in application.", err);
}
private void HandleObjectNotFound() {
Server.ClearError();
Response.Clear();
// new HttpExcepton(404, "Not Found"); // Throw or not to throw?
Response.StatusCode = 404;
Response.StatusDescription = "Not Found";
Response.StatusDescription = "Not Found";
Response.Write("The whole HTML body explaining whata 404 is??");
}
The problem is that I cannot configure default customErrors to work with it. When it is on then it never redirects to the page specified in customErrors: <error statusCode="404" redirect="404.html"/>. I also tried to raise new HttpExcepton(404, "Not Found") from the handler but then the response code is 200 which I don't understand why. So the questions are:
1-What is the proper way of translating AnException into HTTP 404 response?
2- How does customErrors section work when handling exceptions in Application_Error?
3- Why throwing HttpException(404) renders (blank) page with success (200) status?
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[code]...
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