I've got informed that following the general Microsoft recommendation our web servers will be reconfigured; among other things the allowSubDirConfig setting should be set to false. Thus, our ASP.NET applications must use a single Web.config at their root level (which is quite okay for our applications by the way).
However, ASP.NET MVC uses a "non root level" configuration file (by default!) for the Views directory, which contains a simple (but important?) web server related section:
<system.webServer>
<handlers>
<remove name="BlockViewHandler" />
<add name="BlockViewHandler"
path="*"
verb="*"
preCondition="integratedMode"
type="System.Web.HttpNotFoundHandler" />
</handlers>
</system.webServer>
Regarding to a post by Phil Haack this is security related, hence important.
Since the other .NET Framework related sections still work, because the ASP.NET runtime does not obey the allowSubDirConfig setting, an ASP.NET MVC application still works too. So the ignored web server configuration doesn't really attract attention during general usage, although i've a bad feeling about it.
Isn't that a lousy idea? If web servers are configured that way (by recommendation), how vulnerable are those ASP.NET MVC applications out there?
The HttpNotFoundHandler has a path attribute which means you can add it to the root config file and point path to the Views folders and you would not be altering the security level in any way:
<system.webServer>
<handlers>
<remove name="BlockViewHandler"/>
<add name="BlockViewHandler" path="Views/*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
</handlers>
</system.webServer>
This will work with a basic web.config file, but beware if you are adding/removing handlers as part of your application. Handlers that come before the BlockViewHandler could still deliver content from the Views subfolder (but then I believe this is also the case with the standard web.config in the Views directory unless you remove the handler there specifically).
Generally speaking IIS will not serve .cshtml files from the Views folder (unless specifically allowed) even if the system.webServer section is missing/ignored in the Views subdirectory.
But it would serve other files (e.g. html,css,js) which would be blocked by the BlockViewHandler handler which could be regarded as reduced security.
I have an ASP.NET Web API which works fine when running on "IIS Express" with localhost:1783
But when I uncross the "Use IIS Express" and then press "Create Virtual Directory"...
...I just get 404 errors:
Any ideas whats wrong? Thanks!
All you really need to add to the web.config file is:
<handlers>
<!-- Your other remove tags-->
<remove name="UrlRoutingModule-4.0"/>
<!-- Your other add tags-->
<add name="UrlRoutingModule-4.0" path="*" verb="*" type="System.Web.Routing.UrlRoutingModule" preCondition=""/>
</handlers>
Note that none of those have a particular order, though you want your removes before your adds.
The reason that we end up getting a 404 is because the Url Routing Module only kicks in for the root of the website in IIS. By adding the module to this application's config, we're having the module to run under this application's path (your subdirectory path), and the routing module kicks in.
For me, in addition to having runAllManagedModulesForAllRequests="true" I also had to edit the "path"
attribute below. Previously my path attribute was "*." which means it only executed on url's containing a dot
character. However, my application's url's don't contain a dot. When I switched path to "*" then it worked.
Here's what I have now:
<system.webServer>
<validation validateIntegratedModeConfiguration="false" />
<modules runAllManagedModulesForAllRequests="true">
<remove name="WebDAVModule"/>
</modules>
<handlers>
<remove name="WebDAV" />
<remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
<remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
<add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*" verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
</system.webServer>
You may need to install Hotfix KB980368.
This article describes a update that enables certain Internet Information Services (IIS) 7.0 or IIS 7.5 handlers to handle requests whose URLs do not end with a period. Specifically, these handlers are mapped to "." request paths. Currently, a handler that is mapped to a "." request path handles only requests whose URLs end with a period. For example, the handler handles only requests whose URLs resemble the following URL:
http://www.example.com/ExampleSite/ExampleFile.
After you apply this update, handlers that are mapped to a "*." request path can handle requests whose URLs end with a period and requests whose URLs do not end with a period. For example, the handler can now handle requests that resemble the following URLs:
http://www.example.com/ExampleSite/ExampleFile
http://www.example.com/ExampleSite/ExampleFile.
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.
This issue can also happen due to the following
1.In the Web.Config
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
</system.webServer>
2.Make sure the following are available in the bin folder on the server where the Web API is deployed
•System.Net.Http
•System.Net.Http.Formatting
•System.Web.Http.WebHost
•System.Web.Http
These assemblies won't be copied in the bin folder by default if the publish is through Visual Studio because the Web API packages are installed through Nuget in the development machine. Still if you want to achieve these files to be available as part of Visual Studio publish then you need to set CopyLocal to True for these Assemblies
Some people say runAllManagedModulesForAllRequests="true" will have performance issues and MVC routing issues.
They suggest to use the following:
http://www.britishdeveloper.co.uk/2010/06/dont-use-modules-runallmanagedmodulesfo.html
http://bartwullems.blogspot.com/2012/06/optimize-performance-of-your-web.html
I have been battling this problem for a couple of days trying all kinds of things suggested. My dev machine was working fine, but the new machine I was deploying to was giving me the 404 error.
In IIS manager, I compared the handler mappings on both machines to realize that a lot of handlers were missing. Turns out that ASP.Net 5 was not installed on the machine.
For me, this issue was slightly different than other answers, as I was only receiving 404s on OPTIONS, yet I already had OPTIONS specifically stated in my Integrated Extensionless URL Handler options. Very confusing.
As others have stated, runAllManagedModulesForAllRequests="true" in
the modules node is an easy way to blanket-fix most Web API 404 issues - although I prefer #DavidAndroidDev 's answer which is much less intrusive. But there was something additional in my case.
Unfortunately, I had this set in IIS under Request Filtering in the site:
By adding the following security node to the web.config was necessary to knock that out - full system.webserver included for context:
<system.webServer>
<modules runAllManagedModulesForAllRequests="true">
<remove name="WebDAVModule" />
</modules>
<handlers>
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<remove name="OPTIONSVerbHandler" />
<remove name="TRACEVerbHandler" />
<remove name="WebDAV" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
<security>
<requestFiltering>
<verbs>
<remove verb="OPTIONS" />
</verbs>
</requestFiltering>
</security>
</system.webServer>
Although it's not the perfect answer for this question, it is the first result for "IIS OPTIONS 404" on Google, so I hope this helps someone out; cost me an hour today.
I had this problem with Blazor and .Net Core and found that incorporating the NavManagers "baseUrl" into my calls to the controller solved the issue regardless of using a Virtual Directory or the root website.
This worked for me!
string baseUrl = NavigationManager.BaseUri.ToString();
NavigationManager.NavigateTo(**baseUrl** + $"api/Download/DownloadFile?FileName="
+ sFilename, true);
I you are using Visual Studio 2012, download and install Update 2 that Microsoft released recently (as of 4/2013).
Visual Studio 2012 Update 2
There are some bug fixes in that update related to the issue.
I had as same problem . afer lot of R&D i found the problem.
but as long as your configuration are finne mean that aspnet 64 bit and the IIS well then
the only problem i saw is the path " web api taking the local directiry path" so that you need to avid it. by like this.. ~../../../api/products/
thank you very much for posting the problem. i leanred alot abt iis and other setting in config file.
For me I received a 404 error on my websites NOT using IIS Express (using Local IIS) while running an application that WAS using IIS Express. If I would close the browser that was used to run IIS Express, then the 404 would go away. For me I had my IIS Express project calling into Local IIS services, so I converted the IIS Express project to use Local IIS and then everything worked. It seems that you can't run both a non-IIS Express and Local IIS website at the same time for some reason.
Spend a whole week, after all the following setting worked ! and finally saved.
Removing the UrlScan from ISAPI fileters in IIS fixes the problem in our case
I need to write a HttpHandler that will serve up JavaScript files which are embedded resources in .DLLs in my project. A reference in a view cannot directly see such a resource, so I planned to use a HttpHandler module that would intercept any request with a path /js/[file] , find a matching embedded file and return the script.
The problem is that my HttpHandler code is never called, despite trying lots of different settings in the section of web.config. I'm obviously missing something but with no error messages I cannot see what that is. All I ever get is a 404 from the static file handler.
Q1) Am I missing something obvious?
Q2) Is there a way to get IIS to tell me why it is not calling my handler?
Summary: I am testing on IIS Express (v8) for an ASP.NET MVC 4 application.
I created a simple library that implements IHttpHandler and added a reference to this in my test MVC application, and the following lines in web.config:
<system.webServer>
<validation validateIntegratedModeConfiguration="true" />
<handlers>
<add name="ejs" path="js/*" verb="*" type="EmbeddedJsHandler.EmbeddedJsHandler, EmbeddedJsHandler" preCondition="integratedMode" />
The library is there, but it is never called. Any request with /js/test.js or whatever just results in a 404 error.
So far I've tried lots of different configurations and settings in the handler code. I've tried preCondition, resourceType="Unspecified", modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll"
I've tried paths:
js/*.js
js/*
js/*.*
I've checked the integrated mode settings section (in system.webServer) is being used, and confirmed it is.
I've searched stack overflow for similar cases, and tried many of the possible solutions.. still no joy.
Heck even Jon Skeet has these sort of problems!
Why isn't my IHttpHandler being called?
Finally figured it out by accident - it was a missing routes.IgnoreRoute() in the RouteConfig.cs file - the MVC routing engine wasn't configured to ignore this path, so was passing it to the static file handler.
Doh!
Check this:
How to: Register HTTP Handlers:
To register an HTTP handler for IIS 7.0 running in Integrated Mode:
Compile the HTTP handler class and copy the resulting assembly to the Bin folder under the application's root folder.
In the application's Web.config file, create a handlers element in the system.webServer section.
The following example shows how to register an HTTP handler that responds to requests for the SampleHandler.new resource. The handler is defined as the class SampleHandler in the assembly SampleHandlerAssembly.
<configuration>
<system.webServer>
<handlers>
<add name="SampleHandler" verb="*"
path="SampleHandler.new"
type="SampleHandler, SampleHandlerAssembly"
resourceType="Unspecified" />
</handlers>
</system.webServer>
</configuration>
Note: The resourceType attribute performs the same function as the Verify file exists option in IIS manager for IIS 6.0.
For IIS 7.0 running in Integrated mode, only the registration in the handlers element is required.
I cannot tell you directly why your handler isn't working, but I will give you an example of a handler we use and works for us:
<system.webServer>
<handlers>
<add name="JS handler" path="*.js" verb="*" type="Handlers.Minifiers.JSMinify" resourceType="Unspecified" preCondition="integratedMode" />
</handlers>
</system.webServer>
We also have this segment, which is at least necessary for running in Cassini
<system.web>
<httpHandlers>
<add verb="*" path="*.js" type="Handlers.Minifiers.JSMinify" validate="false"/>
</httpHandlers>
</system.web>
If this doesn't help, have tou tried using path="/js/*"?
I am experimenting with the integrated authentication mode for static content in IIS7. I followed the instructions in this article: https://web.archive.org/web/20210612113955/https://aspnet.4guysfromrolla.com/articles/122408-1.aspx
It is working fine if I allow/deny access by login status (like in the article). However I want to allow/deny access based on roles (using the ASP.NET built in Roles Provider). When I put an allow rule for the role "Admin" in the web.config and deny rule for all other users I am not able to access the static files even when I login as an admin. The same folder contains non-static content (aspx pages) that are accessed just fine based on the Role Provider information.
Any ideas?
Try adding the following to your <system.webServer> <modules> block:
<configuration>
<system.webServer>
<modules>
<remove name="FormsAuthentication" />
<add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule" />
<remove name="UrlAuthorization" />
<add name="UrlAuthorization" type="System.Web.Security.UrlAuthorizationModule" />
<remove name="DefaultAuthentication" />
<add name="DefaultAuthentication" type="System.Web.Security.DefaultAuthenticationModule" />
<remove name="RoleManager" />
<add name="RoleManager" type="System.Web.Security.RoleManagerModule" />
</modules>
</system.webServer>
</configuration>
The RoleManager bit is key, and it's not included in any of the online examples that I could find. Without that, the user's role membership isn't initialized for static content, so role-based authorization will always fail.
(Disclaimer: I've pieced this together myself based on my limited understanding of IIS, but it seems to work.)
Edit (in response to your comment): Sorry, I don't know much about how RoleManager depends on other modules. You can view the default IIS configuration by looking at c:\Windows\System32\inetsrv\config\applicationHost.config (at least, that's the past on my Windows Vista machine) to see the order in which modules are loaded (note the use of managedHandler by default to restrict RoleManager to non-static content), and MSDN covers RoleManagerModule along with the rest of the modules in the System.Web.Security namespace, so you could probably find what you need there.
I would say the most likely culprit is that the static files are not being processed by ASP.NET but being left up to IIS.
Does it work if you add a wildcard script mapping?
I'm trying to create a custom ASP.NET HttpHandler to work with any requests to a WCF web services (*.svc) to return a simple predefined SOAP message.
However, after added the HttpHandler to the web.config as shown below. It seems that IIS doesn't pick up the handler to execute. But, the same handler seems to be working fine with *.aspx
<remove verb="*" path="*.svc"/>
<add verb="*" path="*.svc" type="… " />
Does anyone know how to make the HttpHandler to work with the svc extension? or
Are there any other techniques to achieve the same goal?
Thank you everyone for your responses. I got my custom HttpHandler working now after adding the following config into the web.config file.
<compilation>
<buildProviders>
<remove extension=".svc" />
</buildProviders>
</compilation>
In your web.config you need to add the following so that IIS will forward the response through to your handler:
<compilation>
<buildProviders>
<remove extension=".svc" />
</buildProviders>
</compilation>
More information on MSDN.
Adding this as a proper answer.
You could simply not use the .svc extension... just use anything else that works, and tell the client the address. There may be additional goo associated with that particular exntension (dynamic compilation, etc).