Why isn't my IHttpHandler being called? - asp.net

I'm trying to get a custom handler to work for a specific URL (or set of URLs) in ASP.NET 3.5.
The handler doesn't actually do anything significant yet - it just logs the request. I can post the code if anyone things it's relevant, but I really don't think it's being called at all. (In particular, for normal exceptions I get a custom error page and logging... here I'm just getting the vanilla IIS 404.)
Here's the relevant bit of the web.config file:
<system.web>
<httpHandlers>
<add verb="GET,POST" path="*.robot" validate="false"
type="CSharpInDepth.Wave.RobotHandler, CSharpInDepth"/>
</httpHandlers>
</system.web>
(Obviously there's other stuff in that section too, but I don't think it's relevant.)
Locally, running under the dev server, it works fine. On my real box, I always get a 404. Everything under the web site directory itself is the same (replicated via svn). That includes the bin directory containing CSharpInDepth.dll, which I've verified contains CSharpInDepth.Wave.RobotHandler.
I try to fetch http://csharpindepth.com/foo.robot and just get a 404.
I've tried with and without the assembly name, specific URLs or wildcarded ones... nothing's working.
I'm sure I've just missed some simple flag somewhere in the IIS configuration, but I'm blowed if I can find it...
EDIT: It's IIS version 6. Attempting to add *.robot to the ISAPI filter now...

Well if the hosting box is IIS7 in integrated pipeline you need to add it into the other bit of the config:
<system.webmodules>
....
<modules>
<add name="RobotHandler" type="CSharpInDepth.Wave.RobotHandler, CSharpInDepth"/>
</modules>
....
</system.webmodules>
If it's IIS6 then you'll need to map *.robots to the ASP.NET ISAPI DLL.
(For the non-Skeets you do this as follows)
Open up IIS admin.
Right click on
the Web site you want to configure
and select Properties form the
context menu. This will display the
Web Site Properties dialog.
Select
the Home Directory tab and click the
Configuration button. This will
display the Application
Configuration dialog box.
Click
Add.
Select the aspnet_isapi.dll
from the .NET framework directory,
the extension you want mapped and
either All Verbs, or just the ones
you want to map.
Click ok.

Jon,
You'll have to configure the IIS script mappings to pass *.robot to aspnet_isapi.dll.

Related

IIS / ASP.NET: One URL returning 403 on one server despite other URLs in site working fine

I have taken over the maintenance of a production website at a new job that is written in ASP.NET 4 Webforms and that runs on IIS 6 on Windows Server 2003. I am not familiar with Webforms nor managing IIS...so I am kind of working things out as I go here.
I have done several deployments to our production server which have worked fine, but am now setting up a test environment that is identical, just a different IP address/domain, so we can properly test changes first.
I have a problem where on this test site any URL that does NOT end with a reference to a file (always .aspx on this site) will return a 403 error on this server. For example http://users.test.oursite.com/admin will always return a 403 error when logged into the site. It should be redirecting to http://users.test.oursite.com/admin/organisation.aspx. Having an MVC background I am not even sure how this happens...but it does in production.
Browsing links within the site is fine as they always reference an .aspx file. Manually typing URLS that reference an .aspx file is fine, just not when the URL does not contain a file. This is not a problem on the production server.
As I said, I am not familiar with WebForms or managing IIS itself...so I have kind of run out of places to look.
Is there anything that comes to mind that I should be looking at that could be causing this problem?
In WebForms typically there is no routing involved.
You need to either provide a full path on the URL ending with .aspx OR
setup default documents for your website. (Index.aspx, Default.aspx etc.)
http://www.iis.net/configreference/system.webserver/defaultdocument
OR
<configuration>
<system.webServer>
<defaultDocument enabled="true">
<files>
<add value="home.html" />
</files>
</defaultDocument>
</system.webServer>
</configuration>
Default documents can be setup in IIS Properties or via web.config.
Otherwise you need to provide the full path.
And because you haven't setup the DirectoryBrowsing (in IIS), you get a 403 Error when you try to access the Directory.
Enable the Directory Browsing option in IIS (not recommended) if you want this error to go away.

ASPX page within a .aspx page with iframe throws 500.23 error

I'm trying to embed a ChartModule.aspx page within a Default.aspx page using an iframe.
The ChartModule has a button event which updates a chart. The ChartModule has its own ChartsModule.cs.
I'm getting this error:
HTTP Error 500.23 - Internal Server Error An ASP.NET setting has been
detected that does not apply in Integrated managed pipeline mode.Most
likely causes:
•This application defines configuration in the system.web/httpHandlers
section. Things you can try: •Migrate the configuration to the
system.webServer/handlers section. You can do so manually or by using
AppCmd from the command line. For example, from the IIS Express
install directory, run appcmd migrate config "Default Web Site/".
Using AppCmd to migrate your application will enable it to work in
Integrated mode. It will continue to work in Classic mode and on
previous versions of IIS. •If you are certain that it is OK to ignore
this error, it can be disabled by setting
system.webServer/validation#validateIntegratedModeConfiguration to
false. •Alternatively, switch the application to a Classic mode
application pool. For example, from the IIS Express install directory,
run appcmd set app "Default Web Site/"
/applicationPool:"Clr4ClassicAppPool". Only do this if you are unable
to migrate your application.
Detailed Error Information: Module ConfigurationValidationModule
Notification BeginRequest Handler
PageHandlerFactory-Integrated-4.0 Error Code 0x80070032 Requested
URL http://localhost:4161/Default.aspx Physical Path
C:\Documents and
Settings\singhm\Desktop\Temp\Trial2\Trial2\Default.aspx Logon Method
Not yet determined Logon User Not yet determined Request Tracing
Directory
Why is this?
While this may not answer your question directly, here is a thought:
If you have the option, consider turning ChartModule.aspx into a UserControl (ascx), which acts just like another "page" (same lifecycle, its own codebehind file, etc) but integrates more cleanly into an existing aspx page. The above link should be a good introduction to creating and using UserControls.
The error message contains a clue to the solution:
setting system.webServer/validation#validateIntegratedModeConfiguration to false
So make sure the following is present in your web.config:
<validation validateIntegratedModeConfiguration="false"/>
For example:
<configuration>
<!-- your existing settings -->
<system.webServer>
<!-- Add this to here.... -->
<validation validateIntegratedModeConfiguration="false"/>
</system.webServer>
</configuration>
IIS 7 and ASP.NET are quite helpful these days with regard to to error messages and hints contained therein so you should take the time to read them.
I would really recommend using a usercontrol page instead of iframes in asp.net this way you can bind that usercontrol by doing
public override DataBind()
in that you can pass anything into that usercontrol page like refresh data, load certain data, etc..

UrlRewriting.Net Module + IIS7 Equals Page.User == null?

I've used the UrlRewriting.Net module for a couple years now without any problems in Windows XP and Windows 2003. I just recently upgraded my home PC to Windows 7 and started developing a new website.
The plan was to use .html extensions and rewrite them to their .aspx counterparts using the UrlRewriting.Net module. Everything works flawlessly in VWD 2008, but when I try running it through IIS7 it is a different story.
When I try to access a page via the .html rewrite I can no longer access Page.User; it keeps returning null. If I hit the page using it's .aspx extension, Page.User is correctly populated. I should also mention that I have a LoginView controller in my Master Page and it suffers from the same symptoms: When accessing via .html extension it shows the AnonyousTemplate; When using .aspx extension it properly shows the LoggedInTemplate. I'm guessing the two are related.
[Note: I've also tried extensionless URLs and they exhibit the same problem]
The only way I've gotten it to work is to switch the application pool to Classic, which then requires me to add an ASP.Net ddl handler for the .html extension [otherwise it is handled by the StaticFileHandler and comes up as a 404 error]. However, I'd like my web app to run properly for people without having to fiddle around with IIS.
So I am left with several questions:
Does anyone have ideas as to why Page.User always equals null for .html => .aspx rewritten pages?
Why does it work in VWD 2008, but not IIS7?
What changed from IIS6 => IIS7 that could have caused this?
Any other thoughts on workarounds?
[Note: I just tried a .aspx => .aspx rewrite and it did not exhibit the problem. Not really what I want, but thought I should mention it.]
Just had a breakthrough with the UrlRewriting.Net module. This makes it work in Integrated Mode in IIS7:
<modules runAllManagedModulesForAllRequests="true">
After figuring it out I did a search on "runAllManagedModulesForAllRequests" and the first thing that popped up was Scott Guthrie's blog which actually talks about using it for this purpose.
Another approach that seems to work is to remove the Session module and readd it leaving the "Invoke only for requests to ASP.NET applications or managed handlers" checkbox unchecked. It looks like this in the web.config file:
<system.webServer>
<modules>
<remove name="Session" />
<add name="SessionManualAdd" type="System.Web.SessionState.SessionStateModule, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</modules>
</system.webServer>
It seems the problem is that the Session module doesn't execute for say '*.htm' files when HttpContext.RewritePath is used, but removing and readding the module in this fashion causes the Session handler to be executed for the request.
This solution was suggested on the thread below. Unfortunately Microsoft chose not to explain the reasoning behind this behavior fully:
http://connect.microsoft.com/VisualStudio/feedback/details/357248/context-rewritepath-disables-session-module-in-iis7
Microsoft included a fix for this issue (at least for extensionless urls) in Service Pack 1 for Win7 and Windows Server 2008 R2:
http://www.microsoft.com/download/en/details.aspx?id=5842
Also available as a hotfix: http://support.microsoft.com/kb/980368
After this patch is applied, ASP.NET 4 applications can handle requests for extensionless URLs. Therefore, managed HttpModules that run prior to handler execution will run. In some cases, the HttpModules can return errors for extensionless URLs. For example, an HttpModule that was written to expect only .aspx requests may now return errors when it tries to access the HttpContext.Session property.
After applying SP1 or the hotfix, no web.config changes are needed to make the session and forms auth work for extensionless URLs rewritten to asp.net pages/handlers/etc.
I don't know if this fixes anything for rewrites to static file extensions like .htm. My guess is, probably not. I would try to avoid setting runAllManagedModulesForAllRequests="true" in production environments, because it adds unnecessary overhead on static file requests.

How do you set handler mapping to a directory in IIS 6.0?

I have IIS 7.0 on my development machine and IIS 6.0 on my server. On my development machine I was able to set a handler map on a directory within my site called /ViewHtml/ and I mapped it to asp.net. In my global.asax I check the request sent to asp.net for /ViewHtml/ and I serve the appropriate html file(html version of a Doc, Power Point, or Excel file) located outside this apps virtual directory. I am doing it this way because all files are permission protected, we didn't want to put these files in are database due to scalability, and I need to hide the path to these file on the server. This all works in IIS 7.0 exactly how I would like it to. Although I have not been able to get my IIS 6.0 server configured to map all requests to that directory to asp.net.
Any ideas? Thanks Guys?
I set up a web application using the same configuration you're using and I'm also getting the 404. I don't know why it works in IIS 7, but here's what I had to do to fix it.
Create a class that implements the System.Web.IHttpHandler class. move the the code from Application_BeginRequest to your implementation of IHttpHandler.ProcessRequest.
Now you just have to register your HTTP handler with ASP.NET. To do so add an entry in your Web.config at /configuration/system.web/httphandlers.
Web.config Example:
...
<httpHandlers>
<clear />
<add verb="*" path="*" type="namespace.classname, assemblyname" />
</httpHandlers>
...
That entry is telling ASP.NET to handle HTTP requests with any extension and any HTTP method by running the code in your HTTP hander. Note that I'm also clearing all the previously definded handlers (defined in the machine's web.config).
Note that you will still need the Application Mapping configured in IIS.
If I understand the problem correctly, it sounds like you need add a "Wildcard Application Mapping" for your virtual directory. In other words, you want to forward all requests to any file extension to ASP.NET's ISAPI extension.
To do so, open the properties of your virtual directory. On the Virtual Directory tab (Home Directory tab if it's a web site), click the Configuration... button. Click the Insert... button next to the bottom list box in the dialog that shows up. In this dialog, choose "%SYSTEMROOT%\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll" as the executable and make sure to un-check "Verify that file exists" checkbox, since the files to be requested don't live in your virtual directory.
I hope this helps!
i think your problem is all about access policy , you have to make sure that the access policy is Read and not None , cz with None you have no permission to even read files from your website

Extensionless Page Requests

I have a customer of ours that sent out a publication referring to my site but they used the wrong address...they did not provide a page name...it looks like this:
mywebsite.org/Resources/toolkits/bridging
when it should have been
mywebsite.org/Resources/toolkits/bridging/default.aspx
Is there a way to tell ASP.NET to default to this default.aspx when it sees this kind of request or even better, have IIS 7 handle this easily?
This site is live so I would like to avoid having to introduce code if possible.
As per other suggestions, this should be done in the IIS configuration for your website using the IIS Admin tool.
There is however, another alternative - you can add a section in the web.config of your actual ASP.NET application, allowing you to override the IIS configuration right from your application:
<system.webServer>
<defaultDocument>
<files>
<clear />
<!-- Specify each of your files by order of preference here -->
<add value="Default.aspx" />
<add value="Index.aspx" />
<add value="MyOtherPage.aspx" />
</files>
</defaultDocument>
</system.webServer>
The caveat to this though is it may be a little obtuse when the IIS administrator can't figure out why the server configuration isn't working the way he's got it configured. It's not always right to do something just because you can.
Finally, just in case you don't have access to the IIS server or your IIS administrator has reasons for not adding Default.aspx to the default document list in the IIS configuration and for whatever reason, you don't wish to override the IIS configuration in your web.config file, then the quickest and simplest way is to simply create a file called default.asp in that directory containing:
<% Response.Redirect("default.aspx") %>
Default.asp is in the default document list on IIS. The code will automatically redirect the call to the correct page. The downside to this approach though is that there's a performance hit - every time someone calls default.asp - directly or otherwise, the redirect needs to happen which isn't free.
In the Documents tab of the web site properties in IIS you can specify default documents. If you are using .Net2.0 or later on that machine then Default.aspx should already be set....
Default.aspx is not, oddly enough, set as the default document in an IIS installation; In IIS 7, the setting is under "HTTP Features", called "Default Document". Add default.aspx to that list and you should be OK.
If not, you'll need to add a 404 handler that redirects when it sees that URL.

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