Can ASP.Net routing (not MVC) be used to serve static files?
Say I want to route
http://domain.tld/static/picture.jpg
to
http://domain.tld/a/b/c/picture.jpg
and I want to do it dynamically in the sense that the rewritten URL is computed on the fly. I cannot set up a static route once and for all.
Anyway, I can create a route like this:
routes.Add( "StaticRoute", new Route("static/{file}", new FileRouteHandler()) );
In the FileRouteHandler.ProcessRequest
method I can rewrite the path from /static/picture.jpg
to /a/b/c/picture.jpg
. I then want to create a handler for static files. ASP.NET uses the StaticFileHandler
for this purpose. Unfortunately, this class is internal. I have tried to create the handler using reflection and it actually works:
Assembly assembly = Assembly.GetAssembly(typeof(IHttpHandler)); Type staticFileHandlerType = assembly.GetType("System.Web.StaticFileHandler"); ConstructorInfo constructorInfo = staticFileHandlerType.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null); return (IHttpHandler) constructorInfo.Invoke(null);
But using internal types doesn’t seem to be the proper solution. Another option is to implement my own StaticFileHandler
, but doing so properly (supporting HTTP stuff like ranges and etags) is non-trivial.
How should I approach routing of static files in ASP.NET?
Answers:
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Method 1
Why not use IIS to do this? You could create a redirect rule to point any requests from the first route to the second one before it even gets to your application. Because of this, it would be a quicker method for redirecting requests.
Assuming you have IIS7+, you would do something like…
<rule name="Redirect Static Images" stopProcessing="true"> <match url="^static/?(.*)$" /> <action type="Redirect" url="/a/b/c/{R:1}" redirectType="Permanent" /> </rule>
Or, if you don’t need to redirect, as suggested by @ni5ni6:
<rule name="Rewrite Static Images" stopProcessing="true"> <match url="^static/?(.*)$" /> <action type="Rewrite" url="/a/b/c/{R:1}" /> </rule>
Edit 2015-06-17 for @RyanDawkins:
And if you’re wondering where the rewrite rule goes, here is a map of its location in the web.config
file.
<?xml version="1.0" encoding="utf-8" ?> <configuration> <system.webServer> <rewrite> <rules> <!-- rules go below --> <rule name="Redirect Static Images" stopProcessing="true"> <match url="^static/?(.*)$" /> <action type="Redirect" url="/a/b/c/{R:1}" redirectType="Permanent" /> </rule> </rules> </rewrite> </system.webServer> </configuration>
Method 2
After digging through this problem for a few hours, I found that simply adding ignore rules will get your static files served.
In RegisterRoutes(RouteCollection routes), add the following ignore rules:
routes.IgnoreRoute("{file}.js"); routes.IgnoreRoute("{file}.html");
Method 3
I’ve had a similar problem. I ended up using HttpContext.RewritePath:
public class MyApplication : HttpApplication { private readonly Regex r = new Regex("^/static/(.*)$", RegexOptions.IgnoreCase); public override void Init() { BeginRequest += OnBeginRequest; } protected void OnBeginRequest(object sender, EventArgs e) { var match = r.Match(Request.Url.AbsolutePath); if (match.Success) { var fileName = match.Groups[1].Value; Context.RewritePath(string.Format("/a/b/c/{0}", fileName)); } } }
Method 4
I came up with an alternative to using the internal StaticFileHandler
. In the IRouteHandler
I call HttpServerUtility.Transfer
:
public class FileRouteHandler : IRouteHandler { public IHttpHandler GetHttpHandler(RequestContext requestContext) { String fileName = (String) requestContext.RouteData.Values["file"]; // Contrived example of mapping. String routedPath = String.Format("/a/b/c/{0}", fileName); HttpContext.Current.Server.Transfer(routedPath); return null; // Never reached. } }
This is a hack. The IRouteHandler
is supposed to return an IHttpHandler
and not abort and transfer the current request. However, it does actually achieve what I want.
Using the internal StaticFileHandler
is also somewhat a hack since I need reflection to get access to it, but at least there is some documentation on StaticFileHandler
on MSDN making it a slightly more “official” class. Unfortunately I don’t think it is possible to reflect on internal classes in a partial trust environment.
I will stick to using StaticFileHandler
as I don’t think it will get removed from ASP.NET in the foreseeable future.
Method 5
You need to add TransferRequestHandler for handling your static files.Please see following answer
https://stackoverflow.com/a/21724783/22858
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