I have problem. Locally everything works fine but in the production server it always throws exception 'Response is not available in this context'. What can be the problem? I've noticed that a lot of people experience this problem due to some changes of global.asax. Here is the code of global.asax, the part related to application start.
protected void Application_Start() {
AreaRegistration.RegisterAllAreas();
RegisterRoutes(RouteTable.Routes);
Application["SystemUser"] = TUser.GetUserByIdentifier("system").UID;
InitializeSolrInstances();
SearchIndexer.DoIndex();
StartRatingTimer();
SolrManager.RecalculateMostRequested();
}
private static void InitializeSolrInstances() {
SolrConfigurationManager.InitSolrConnection<OfferItemPresenter>(Resources.ApplicationResources.SolrServiceURL + "/offer");
SolrConfigurationManager.InitSolrConnection<SavedQueryItemPresenter>(Resources.ApplicationResources.SolrServiceURL + "/savedquery");
SolrConfigurationManager.InitSolrConnection<TopProductsPresenter>(Resources.ApplicationResources.SolrServiceURL + "/topproducts");
SolrConfigurationManager.InitSolrConnection<TopSellersPresenter>(Resources.ApplicationResources.SolrServiceURL + "/topsellers");
SolrConfigurationManager.InitSolrConnection<MostRequestedItemPresenter>(Resources.ApplicationResources.SolrServiceURL + "/mostrequested");
SolrConfigurationManager.InitSolrConnection<MostRequestedQuery>(Resources.ApplicationResources.SolrServiceURL + "/requestedquery");
}
private void StartRatingTimer() {
_LastRatingRenewedTime = DateTime.Now;
DateTime CurrentTime = DateTime.Now;
DateTime StartTime = new DateTime(2011, 1, 1);
GlobalSettings.ReIndexMainSolrCores(StartTime, CurrentTime);
Timer OfferAndUserRatingRenewerTimer = new Timer() {
/*Timer interval for 24 hours*/
Interval = 24 * 60 * 60 * 1000, Enabled = true };
OfferAndUserRatingRenewerTimer.Elapsed += new ElapsedEventHandler(OfferAndUserRatingRenewerTimer_Elapsed);
}
public void OfferAndUserRatingRenewerTimer_Elapsed(Object Sender, ElapsedEventArgs e) {
GlobalSettings.ReIndexMainSolrCores(_LastRatingRenewedTime, e.SignalTime);
_LastRatingRenewedTime = e.SignalTime;
}
I do not use Response or Request properties of HttpContext at all. Neither in global asax itself, nor within the methods to be called. Help me.
That what it shows. ` Server Error in '/' Application.
Response is not available in this context.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Response is not available in this context.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): Response is not available in this context.]
System.Web.Util.HttpEncoder.get_Current() +11406684
System.Web.HttpUtility.UrlEncode(String str, Encoding e) +137
SolrNet.Impl.SolrConnection.<Get>b__0(KeyValuePair`2 input) +89
SolrNet.Utils.<Select>d__1a`2.MoveNext() +612
SolrNet.Utils.Func.Reduce(IEnumerable`1 source, TResult startValue, Accumulator`2 accumulator) +393
SolrNet.Impl.SolrConnection.Get(String relativeUrl, IEnumerable`1 parameters) +908
SolrNet.Impl.SolrQueryExecuter`1.Execute(ISolrQuery q, QueryOptions options) +195
SolrNet.Impl.SolrBasicServer`1.Query(ISolrQuery query, QueryOptions options) +176
SolrNet.Impl.SolrServer`1.Query(ISolrQuery query, QueryOptions options) +176
TebeComSearchEngine.SolrManager.RecalculateMostRequested() in SolrManager.cs:77
TebeCom.MvcApplication.Application_Start() in Global.asax.cs:101
[HttpException (0x80004005): Response is not available in this context.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +4043621
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +191
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +352
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +407
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +375
[HttpException (0x80004005): Response is not available in this context.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11612256
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +141
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4842149`
After alot of digging and looking around the SolrNet code, they don't appear to be doing anything wrong. Also, as Darin pointed out in an indirect manner, HttpUtility.UrlEncode should work fine in code without a HttpContext, such as a console application, and it does.
However, as VinayC pointed out in his comment on that answer of Darin's:
Actually, it appears to be a bug. From reflector, actual code appears to be "if (null != current && null != current.Response && ...)" where current is current http context. Issue here is that Response getter throws an exception, instead of returning null
Instead of throwing that overly descriptive exception (no doubt they were trying to be helpful), they should have just returned null and let null reference exceptions happen. In this case, they were simply checking for nulls, so the exception wouldn't have happened anyway! I'll report it as a bug if it hasn't been already.
Unfortunately, what this means to you is that you have pretty much no choice but to run in Classic mode. Technically you could put the call to TebeComSearchEngine.SolrManager.RecalculateMostRequested() in a thread that you spawn in application_start and delay its execution until after the app finishes starting. As far as I know, there is no surefire way to programmatically signal the end of the application starting so, that approach may be a little messy.
If you're up for it though, you could probably get that delayed startup mechanism implemented. Compared to punishing the first visitor to the site, it doesn't seem too bad.
'Response is not available in this context'. What can be the problem?
You are running this in IIS7 Integrated Application Pool mode instead of Classic mode. In Integrated mode you don't have access to the HttpResponse in Application_Start any any attempt to access it will blow.
Here's a blog post which covers a similar situation but with the HttpRequest.
This was discussed about a month ago in the SolrNet mailing list.
It's a regression in ASP.NET 4, here's a mention of this bug.
A future release of SolrNet will replace System.Web.HttpUtility.UrlEncode to work around this bug. (or if you really need this, why not fork the source code and fix it?)
EDIT: I just fixed this.
来源：https://stackoverflow.com/questions/6624210/response-is-not-available-in-this-context