enabling cross-origin resource sharing on IIS7

Question

I recently ran into with posting Javascript requests to another domain   By default XHR  posting to other domains is not allowed   Following the instructions from http   enable-cors org   I enabled this on the other domain    lt  xml version  1 0  encoding  utf-8   gt   lt configuration gt    lt system webServer gt     lt httpProtocol gt       lt customHeaders gt         lt add name  Access-Control-Allow-Origin  value       gt         lt add name  Access-Control-Allow-Methods  value  GET PUT POST DELETE OPTIONS    gt         lt add name  Access-Control-Allow-Headers  value  Content-Type    gt       lt  customHeaders gt     lt  httpProtocol gt    lt  system webServer gt   lt  configuration gt      Everything works fine now  however it is still return a 405 response before sending back the working 200 response   Request URL http   testapi nottherealsite com api Reporting RunReport Request Method OPTIONS Status Code 405 Method Not Allowed Request Headersview source Accept     Accept-Charset ISO-8859-1 utf-8 q 0 7   q 0 3 Accept-Encoding gzip deflate sdch Accept-Language en-GB en-US q 0 8 en q 0 6 Access-Control-Request-Headers origin  content-type  accept Access-Control-Request-Method POST Connection keep-alive Host testapi nottherealsite com Origin http   test nottherealsite com Referer http   test nottherealsite com Reporting User-Agent Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 1  KHTML  like Gecko  Chrome 21 0 1180 89 Safari 537 1 Response Headersview source Access-Control-Allow-Headers Content-Type Access-Control-Allow-Methods GET PUT POST DELETE OPTIONS Access-Control-Allow-Origin   Allow POST Cache-Control private Content-Length 1565 Content-Type text html  charset utf-8 Date Tue  18 Sep 2012 14 26 06 GMT Server Microsoft-IIS 7 5 X-AspNet-Version 4 0 30319 X-Powered-By ASP NET   Update  3 02 2014  There is a recently updated article in MSDN magazine  Detailing CORS Support in ASP NET Web API 2   http   msdn microsoft com en-us magazine dn532203 aspx

User · Answer

Alsalaam Aleykum   The first way is to follow the instructions in this link   http   help infragistics com Help NetAdvantage jQuery 2013 1 CLR4 0 html igOlapXmlaDataSource Configuring IIS for Cross Domain OLAP Data html  Which corresponds to these configuration     x000D   x000D   lt handlers gt  x000D     lt clear   gt  x000D     lt add name  OPTIONSVerbHandler  path     verb  OPTIONS  type    modules  ProtocolSupportModule  scriptProcessor    resourceType  Unspecified  requireAccess  Read  allowPathInfo  false  preCondition    responseBufferLimit  4194304    gt  x000D     lt add name  xamlx-ISAPI-4 0 64bit  path    xamlx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  4194304    gt  x000D     lt add name  xamlx-ISAPI-4 0 32bit  path    xamlx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  4194304    gt  x000D     lt add name  xamlx-Integrated-4 0  path    xamlx  verb  GET HEAD POST DEBUG  type  System Xaml Hosting XamlHttpHandlerFactory  System Xaml Hosting  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  modules  ManagedPipelineHandler  scriptProcessor    x000D    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  rules-ISAPI-4 0 64bit  path    rules  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  rules-ISAPI-4 0 32bit  path    rules  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  rules-Integrated-4 0  path    rules  verb     type  System ServiceModel Activation ServiceHttpHandlerFactory  System ServiceModel Activation  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  modules  ManagedPipelineHandler  x000D    scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  xoml-ISAPI-4 0 64bit  path    xoml  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  xoml-ISAPI-4 0 32bit  path    xoml  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  xoml-Integrated-4 0  path    xoml  verb     type  System ServiceModel Activation ServiceHttpHandlerFactory  System ServiceModel Activation  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  modules  ManagedPipelineHandler  x000D    scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  svc-ISAPI-4 0 64bit  path    svc  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  svc-ISAPI-4 0 32bit  path    svc  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  svc-Integrated-4 0  path    svc  verb     type  System ServiceModel Activation ServiceHttpHandlerFactory  System ServiceModel Activation  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  modules  ManagedPipelineHandler  scriptProcessor    x000D    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  ISAPI-dll  path    dll  verb     type    modules  IsapiModule  scriptProcessor    resourceType  File  requireAccess  Execute  allowPathInfo  true  preCondition    responseBufferLimit  4194304    gt  x000D     lt add name  AXD-ISAPI-4 0 64bit  path    axd  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  PageHandlerFactory-ISAPI-4 0 64bit  path    aspx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  SimpleHandlerFactory-ISAPI-4 0 64bit  path    ashx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  WebServiceHandlerFactory-ISAPI-4 0 64bit  path    asmx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  HttpRemotingHandlerFactory-rem-ISAPI-4 0 64bit  path    rem  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  HttpRemotingHandlerFactory-soap-ISAPI-4 0 64bit  path    soap  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  aspq-ISAPI-4 0 64bit  path    aspq  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness64  x000D    responseBufferLimit  0    gt  x000D     lt add name  cshtm-ISAPI-4 0 64bit  path    cshtm  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  cshtml-ISAPI-4 0 64bit  path    cshtml  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  vbhtm-ISAPI-4 0 64bit  path    vbhtm  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  vbhtml-ISAPI-4 0 64bit  path    vbhtml  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  TraceHandler-Integrated-4 0  path  trace axd  verb  GET HEAD POST DEBUG  type  System Web Handlers TraceHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  WebAdminHandler-Integrated-4 0  path  WebAdmin axd  verb  GET DEBUG  type  System Web Handlers WebAdminHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  AssemblyResourceLoader-Integrated-4 0  path  WebResource axd  verb  GET DEBUG  type  System Web Handlers AssemblyResourceLoader  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  PageHandlerFactory-Integrated-4 0  path    aspx  verb  GET HEAD POST DEBUG  type  System Web UI PageHandlerFactory  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  SimpleHandlerFactory-Integrated-4 0  path    ashx  verb  GET HEAD POST DEBUG  type  System Web UI SimpleHandlerFactory  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  WebServiceHandlerFactory-Integrated-4 0  path    asmx  verb  GET HEAD POST DEBUG  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  modules  ManagedPipelineHandler  x000D    scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  HttpRemotingHandlerFactory-rem-Integrated-4 0  path    rem  verb  GET HEAD POST DEBUG  type  System Runtime Remoting Channels Http HttpRemotingHandlerFactory  System Runtime Remoting  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089  x000D    modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  HttpRemotingHandlerFactory-soap-Integrated-4 0  path    soap  verb  GET HEAD POST DEBUG  type  System Runtime Remoting Channels Http HttpRemotingHandlerFactory  System Runtime Remoting  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089  x000D    modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  aspq-Integrated-4 0  path    aspq  verb  GET HEAD POST DEBUG  type  System Web HttpForbiddenHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  cshtm-Integrated-4 0  path    cshtm  verb  GET HEAD POST DEBUG  type  System Web HttpForbiddenHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  cshtml-Integrated-4 0  path    cshtml  verb  GET HEAD POST DEBUG  type  System Web HttpForbiddenHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  vbhtm-Integrated-4 0  path    vbhtm  verb  GET HEAD POST DEBUG  type  System Web HttpForbiddenHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  vbhtml-Integrated-4 0  path    vbhtml  verb  GET HEAD POST DEBUG  type  System Web HttpForbiddenHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  x000D    responseBufferLimit  4194304    gt  x000D     lt add name  ScriptHandlerFactoryAppServices-Integrated-4 0  path    AppService axd  verb     type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  modules  ManagedPipelineHandler  x000D    scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  ScriptResourceIntegrated-4 0  path   ScriptResource axd  verb  GET HEAD  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  modules  ManagedPipelineHandler  x000D    scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  4194304    gt  x000D     lt add name  AXD-ISAPI-4 0 32bit  path    axd  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  PageHandlerFactory-ISAPI-4 0 32bit  path    aspx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  SimpleHandlerFactory-ISAPI-4 0 32bit  path    ashx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  WebServiceHandlerFactory-ISAPI-4 0 32bit  path    asmx  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  HttpRemotingHandlerFactory-rem-ISAPI-4 0 32bit  path    rem  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  HttpRemotingHandlerFactory-soap-ISAPI-4 0 32bit  path    soap  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  x000D    allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  aspq-ISAPI-4 0 32bit  path    aspq  verb     type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  preCondition  classicMode runtimeVersionv4 0 bitness32  x000D    responseBufferLimit  0    gt  x000D     lt add name  cshtm-ISAPI-4 0 32bit  path    cshtm  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  cshtml-ISAPI-4 0 32bit  path    cshtml  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  vbhtm-ISAPI-4 0 32bit  path    vbhtm  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  vbhtml-ISAPI-4 0 32bit  path    vbhtml  verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  TRACEVerbHandler  path     verb  TRACE  type    modules  ProtocolSupportModule  scriptProcessor    resourceType  Unspecified  requireAccess  None  allowPathInfo  false  preCondition    responseBufferLimit  4194304    gt  x000D     lt add name  ExtensionlessUrlHandler-ISAPI-4 0 32bit  path      verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt  x000D     lt add name  ExtensionlessUrlHandler-ISAPI-4 0 64bit  path      verb  GET HEAD POST DEBUG  type    modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt  x000D     lt add name  ExtensionlessUrlHandler-Integrated-4 0  path      verb  GET HEAD POST DEBUG  type  System Web Handlers TransferRequestHandler  modules  ManagedPipelineHandler  scriptProcessor    resourceType  Unspecified  requireAccess  Script  allowPathInfo  false  x000D    preCondition  integratedMode runtimeVersionv4 0  responseBufferLimit  0    gt  x000D     lt add name  StaticFile  path     verb     type    modules  StaticFileModule DefaultDocumentModule DirectoryListingModule  scriptProcessor    resourceType  Either  requireAccess  Read  allowPathInfo  false  preCondition    responseBufferLimit  4194304  x000D      gt  x000D   lt  handlers gt  x000D   x000D   x000D    The second way is as to respond to the HTTP OPTIONS verb in your BeginRequest method     protected void Application BeginRequest object sender  EventArgs e        HttpContext Current Response AddHeader  Access-Control-Allow-Origin             if  HttpContext Current Request HttpMethod     OPTIONS                 HttpContext Current Response AddHeader  Access-Control-Request-Method    GET  POST  PUT  DELETE             HttpContext Current Response AddHeader  Access-Control-Allow-Headers    Origin Content-Type  Accept            HttpContext Current Response AddHeader  Access-Control-Max-Age    86400       24 hours         HttpContext Current Response End

User · Answer

The 405 response is a  Method not allowed  response  It sounds like your server isn t properly configured to handle CORS preflight requests  You need to do two things   1  Enable IIS7 to respond to HTTP OPTIONS requests  You are getting the 405 because IIS7 is rejecting the OPTIONS request  I don t know how to do this as I m not familiar with IIS7  but there are probably others on Stack Overflow who do   2  Configure your application to respond to CORS preflight requests  You can do this by adding the following two lines underneath the Access-Control-Allow-Origin line in the  lt customHeaders gt  section    lt add name  Access-Control-Allow-Methods  value  GET PUT POST DELETE    gt   lt add name  Access-Control-Allow-Headers  value  Content-Type    gt    You may have to add other values to the Access-Control-Allow-Headers section based on what headers your request is asking for  Do you have the sample code for making a request   You can learn more about CORS and CORS preflight here  http   www html5rocks com en tutorials cors

User · Answer

With ASP net Web API 2 install Microsoft ASP NET Cross Origin support via nuget   http   enable-cors org server aspnet html  public static void Register HttpConfiguration config     var enableCorsAttribute   new EnableCorsAttribute  http   mydomain com                                                       Origin  Content-Type  Accept                                                       GET  PUT  POST  DELETE  OPTIONS            config EnableCors enableCorsAttribute

User · Answer

The solution for me was to add     lt system webServer gt       lt modules runAllManagedModulesForAllRequests  true  gt         lt remove name  WebDAVModule   gt       lt  modules gt   lt  system webServer gt    To my web config

User · Answer

It took Microsoft years to identify the gaps and ship an out-of-band CORS module to solve this problem    Install the module from Microsoft Configure it with snippets   as below   lt configuration gt       lt system webServer gt           lt cors enabled  true  failUnlistedOrigins  true  gt                           lt add origin  http      allowed  true    gt           lt  cors gt       lt  system webServer gt   lt  configuration gt    In general  it is much easier than your custom headers and also offers better handling of preflight requests      In case you need the same for IIS Express  use some PowerShell scripts I wrote

User · Answer

One thing that has not been mentioned in these answers is that if you are using IIS and have sub applications with their own separate web config  you may need to have a web config in the parent directory containing the following code    lt httpProtocol gt     lt customHeaders gt       lt add name  Access-Control-Allow-Origin  value      gt       lt add name  Access-Control-Allow-Headers  value  Content-Type   gt       lt add name  Access-Control-Allow-Methods  value  POST GET OPTIONS   gt     lt  customHeaders gt   lt  httpProtocol gt

User · Answer

It is likely a case of IIS 7  handling  the HTTP OPTIONS response instead of your application specifying it   To determine this  in IIS7     Go to your site s Handler Mappings        Scroll down to  OPTIONSVerbHandler     Change the  ProtocolSupportModule  to  IsapiHandler  Set the executable   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll   Now  your config entries above should kick in when an HTTP OPTIONS verb is sent   Alternatively you can respond to the HTTP OPTIONS verb in your BeginRequest method       protected void Application BeginRequest object sender EventArgs e                HttpContext Current Response AddHeader  Access-Control-Allow-Origin                  if HttpContext Current Request HttpMethod     OPTIONS                           These headers are handling the  pre-flight  OPTIONS call sent by the browser             HttpContext Current Response AddHeader  Access-Control-Allow-Methods    GET  POST  PUT  DELETE                HttpContext Current Response AddHeader  Access-Control-Allow-Headers    Content-Type  Accept                HttpContext Current Response AddHeader  Access-Control-Max-Age    1728000                 HttpContext Current Response End

User · Answer

Elaborating from DavidG answer which is really near of what is required for a basic solution    First  configure the OPTIONSVerbHandler to execute before  Net handlers     In IIS console  select  Handler Mappings   either on server level or site level  beware that on site level it will redefine all the handlers for your site and ignore any change done on server level after that  and of course on server level  this could break other sites if they need their own handling of options verb    In Action pane  select  View ordered list     Seek OPTIONSVerbHandler  and move it up  lots of clicks        You can also do this in web config by redefining all handlers under  lt system webServer gt  lt handlers gt    lt clear gt  then  lt add     gt  them back  this is what does the IIS console for you   By the way  there is no need to ask for  read  permission on this handler   Second  configure custom http headers for your cors needs  such as    lt system webServer gt     lt httpProtocol gt       lt customHeaders gt         lt add name  Access-Control-Allow-Origin  value      gt         lt add name  Access-Control-Allow-Headers  value  Content-Type   gt         lt add name  Access-Control-Allow-Methods  value  POST GET OPTIONS   gt       lt  customHeaders gt     lt  httpProtocol gt   lt  system webServer gt    You can also do this in IIS console    This is a basic solution since it will send cors headers even on request which does not requires it  But with WCF  it looks like being the simpliest one   With MVC or webapi  we could instead handle OPTIONS verb and cors headers by code  either  manually  or with built-in support available in latest version of webapi

User · Answer

I can t post comments so I have to put this in a separate answer  but it s related to the accepted answer by Shah   I initially followed Shahs answer  thank you   by re configuring the OPTIONSVerbHandler in IIS  but my settings were restored when I redeployed my application   I ended up removing the OPTIONSVerbHandler in my Web config instead    lt handlers gt       lt remove name  OPTIONSVerbHandler   gt   lt  handlers gt

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I found the information found at http   help infragistics com Help NetAdvantage jQuery 2013 1 CLR4 0 html igOlapXmlaDataSource Configuring IIS for Cross Domain OLAP Data html to be very helpful in setting up HTTP OPTIONS for a WCF service in IIS 7   I added the following to my web config and then moved the OPTIONSVerbHandler in the IIS 7  hander mappings  list to the top of the list  I also gave the OPTIONSVerbHander read access by double clicking the hander in the handler mappings section then on  Request Restrictions  and then clicking on the access tab   Unfortunately I quickly found that IE doesn t seem to support adding headers to their XDomainRequest object  setting the Content-Type to text xml and adding a SOAPAction header    Just wanted to share this as I spent the better part of a day looking for how to handle it    lt system webServer gt       lt httpProtocol gt           lt customHeaders gt               lt add name  Access-Control-Allow-Origin  value       gt               lt add name  Access-Control-Allow-Methods  value  GET POST OPTIONS    gt               lt add name  Access-Control-Allow-Headers  value  Content-Type  soapaction    gt           lt  customHeaders gt       lt  httpProtocol gt   lt  system webServer gt

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