Html - IIS 7, .Net 4: Server Cannot Append Header After HTTP Headers Have Been Sent?

May 19, 2010

I am getting the following warnings on the Event Log for a Asp.Net WebSite running on IIS 7.

Exception information:
Exception type: HttpException
Exception message: Server cannot append header after HTTP headers have been sent.
at System.Web.Hosting.ISAPIWorkerRequest.SendUnknownResponseHeader(String name, String value)

I tried to debug the WebSite but it just does not show in debugger. The web page which has got this issue contains the following.

Its a content page with a Master page.

It has a grid inside an UpdatePanel which is Triggered by a Timer.

On the specified time grid data is refreshed.

Everytime this happens we see a new warning in the EventLog.

View 1 Replies

Similar Messages:

HttpHandlers / Modules :: Server Cannot Append Header After HTTP Headers Have Been Sent

Sep 3, 2010

Server cannot append header after HTTP headers have been sent



View 2 Replies

WCF / ASMX :: Webservice Header / Error Server Did Not Recognize The Value Of HTTP Header SOAPAction?

Oct 30, 2010

I call a webservices from my javascript and im getting response as error.

Server did not recognize the value of HTTP Header SOAPAction:

View 1 Replies

C# - Server Cannot Modify Cookies After HTTP Headers Have Been Sent?

Mar 31, 2011

I am creating a web application in C#.When my page loads I fire an asynchronous thread to process some data. Part of this processing is the updating of a cookie. However when I save the cookie to the response by System.Web.HttpContext.Current.Response.Cookies.Add(c) where c is the HttpCookie, I get the following exception:HttpException: Server cannot modify cookies after HTTP headers have been sent.

View 3 Replies

MVC :: OnActionExecuted - Server Cannot Modify Cookies After HTTP Headers Have Been Sent?

Apr 1, 2011

We have a basecontroller that has both an OnActionExecuting and OnActionExecuted. Occassionally, the OnActionExecuted will throw an exception 'Server cannot modify cookies after HTTP headers have been sent.'. This doesn't happen all the time, and we can't find a pattern to it. My guess, based on searching, is that filterContext is not always the current context. Is there a way to rewrite the Cookies.Add to get the current context, always? Or is the fact that we are in the ActionExecuted mean the headers will always already have been sent and we shouldn't be doing anything like this in the executed step?


View 1 Replies

Setting Optimum Http Caching Headers And Server Params In .Net MVC And IIS 7.5?

Sep 13, 2010

I have an ASP.Net site (happens to be MVC, but that's not relevant here) with a few pages I'd like cached really well.

Specifically I'd like to achieve:

output cached on the server for 2 hours.if the file content on the server changes, that output cache should be flushed for that page
cached in the browser for 10 minutes (i.e. don't even ask the server if it's that fresh)when the browser does make an actual subsequent request, I'd like it to use etags, so that the server can return a 304 if not modified.

(note - time values above are indicative examples only)
1) and 2) I can achieve by Response.Cache.SetCacheability(HttpCacheability.Server)
I know 3) can be achieved by using max-age and cache-control:private
I can emit etags with Response.Cache.SetETagFromFileDependencies();

but I can't seem to get all of these things to work together. Here's what I have:

Response.Cache.SetMaxAge(TimeSpan.FromSeconds(60 * 10));

In particular:

can browsers do both 3) and 4) like that? When Firefox issues a new request after it expires in the local cache, it does indeed send the etag the server responded with before, but I get a 200 response.setting the variables like above, where would I set the duration of the output caching?

View 1 Replies

MVC :: ActionFilter For Banned Users Causes Error 'Server Cannot Modify Cookies After HTTP Headers Have?

Mar 12, 2011

I am trying to make ActionFilter which redirects banned users to /Error/NoAccess site, so I have ActionFilter:


Before each public class xxxxxxController : Controller I use [NoBannedUsersActionFilter]. But for example on website /Account/LogOff I have error: 'Server cannot modify cookies after HTTP headers have been sent.' and VisualStudio shows me AccountModel.css file and this method:


View 3 Replies

AJAX :: Server Did Not Recognize The Value Of HTTP Header SOAPAction?

Mar 3, 2010

I got the error when I called a webservice

---- Server did not recognize the value of HTTP Header SOAPAction:

The odd thing is that I have several methods in this webservice, and only two of them got me the error message. It used to work, but then gave me the error message after i added some other methods to the asmx file.

The namespace should be the same for all the methods. One more thing to note is: these two methods had return data type DataTable before, and I changed it to DataSet. It should not affect anything, I assume.

View 1 Replies

Cannot Redirect After HTTP Headers Have Been Sent?

Feb 14, 2011

I have created one page to show the progress of payment . After successful payment i need to redirect user to the payment confirmation page. When i am redirecting am getting the following error.

Cannot redirect after HTTP headers have been sent.


View 6 Replies

C# - HTTP 502 Proxy Error - The Size Of The Response Header Is Too Large. Contact Your ISA Server Administrator. (12216)

Feb 23, 2011

Some of my users are getting the following error

HTTP 502 Proxy Error - The size of the response header is too large. Contact your ISA server administrator. (12216) Internet Security and Acceleration Server

I am guessing it has to do with the size of hidden "__ViewState" tag in my ASP.NET pages.

I also realize that this is restriction imposed to by IT on the users end and I have no contol over it.

I disabled ViewState on all the controls in my ASP.NET pages. However, __ViewState is still generated very large (as always) to persist control-state (e.g. checkbox, radiobutton, etc.)

View 2 Replies

Add Response Http Headers In Web Configuration?

May 27, 2010

In my application I need to set a http response header. I'd like to do this in web.config. but I dont'know if this is possible and I can't find it on Google. Solution Finally, after a long search I found the solution. Create a class with this code:

public class myHTTPHeaderModule : IHttpModule
#region IHttpModule Members
public void Dispose()
public void Init(HttpApplication context)
context.EndRequest += new EventHandler(context_EndRequest);
void context_EndRequest(object sender, EventArgs e)
HttpResponse response = HttpContext.Current.Response;
response.AddHeader("Content-Language", "*");

(Don't ask me why to use this event, but it works..) Now add a line in web.config in the HttpModule section:

<add type="namespace.myHTTPHeaderModule, assembly name" name="headers" />
<add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

View 4 Replies

Emulate Specific HTTP Headers?

Oct 5, 2010

I Have a specific set of HTTP response headers I'm trying to recreate in ASP.NET.
Here is how it looks in Fiddler (Raw):

HTTP/1.1 200 OK
Content-Length: 570746
Content-Type: audio/wav
Last-Modified: Wed, 19 May 2010 00:44:38 GMT
Accept-Ranges: bytes
ETag: "379d676ecf6ca1:3178"
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Date: Tue, 05 Oct 2010 18:35:18 GMT

Here is how it looks on the Headers tab (same data. Different view)

I am trying to recreate the same set of headers (different values of course) with code, on an ASP.NET page. The biggest problem is with the cache settings and the ETag. It usually shows some "private" or similar cache setting and no ETag value, even though I'm trying to set it explicitly with


View 1 Replies

Website Is Sending Wrong HTTP Headers?

Feb 4, 2011

This has been bugging me for a while now. Whenever I try to share my website link on Facebook or another link-sharing site, the link-sharing site either removes the URL (like it doesn't recognize it as valid) or in Facebook's case - it can't retrieve meta-data automatically.

I'm pretty sure that it used to work. However, Googling / StackOverflowing for this problem is a difficult task, since I have no idea what possibly could create this problem.

I've tried to create a static .HTM file on my website, and that works fine: test.htm

My default home page is a classic ASP (yeah I know, PHP version in the works) which uses IIS 7 URL Rewrite module.

I've tried to check the resultcodes and headers for both test.htm and my default home page on this page: [URL]

This is the results:


Result code: 200 (OK / OK)
Content-Type: text/html
Last-Modified: Fri, 04 Feb 2011 10:16:55 GMT
Accept-Ranges: bytes
ETag: "0d877a654c4cb1:0"
Server: Microsoft-IIS/7.0
X-Powered-By: ASP.NET
Date: Fri, 04 Feb 2011 10:40:08 GMT
Content-Length: 452

default home page /

Result code: 200 (OK / OK)
Cache-Control: public
Content-Length: 13463
Content-Type: text/html; Charset=UTF-8
Accept-Ranges: bytes
Server: Microsoft-IIS/7.0
X-Powered-By: ASP.NET
Date: Fri, 04 Feb 2011 10:24:22 GMT

The first 4 lines of my default.asp (/) file are:

Response.ContentType = "text/html"
Response.AddHeader "Content-Type", "text/html;charset=UTF-8"
Response.CodePage = 65001
Response.CharSet = "UTF-8"

View 1 Replies

Data Controls :: Scrollable GridView With Fixed Headers - Header Column Alignment

Jan 16, 2014

Scrollable GridView with Fixed Headers inside ASP.Net UpdatePanel using jQuery Plugin. I have one more question in that.  How to adjust the width of the columns headers because for some of my gridviews the headers not showing the proper format.  in the gridview I gave HorizontalAlign="Left" and in the columns I gave 

<asp:BoundField DataField="XXX" HeaderText="XXX" ItemStyle-Width="150px" HeaderStyle-HorizontalAlign="Left" />  

It's not showing in the correct fomart. header is coming to the left side and data is coming to the right side...

View 1 Replies

Use String And Builder To Append Html Elements

Mar 31, 2011

I am having doubt in whether to use string or string builder to append html elements like "div" and others in my page in mvc. Is there any other approach for this thing.

View 7 Replies

Append Attribute To HTML Tag In Content Page?

Aug 24, 2010

I have an ASP.NET content page. The HTML tag associated with the content page is declared in the master page. I need to add an attribute to the HTML tag from the content page. My problem is, I do not know how to access this HTML tag from the content page.

View 3 Replies

Pass Value From One App To Another Via HTTP Header?

Jun 15, 2010

We are implementing a single sign on mechanism in an enterprise environment, where the token is shared between applications using HTTP header. Now, in order to do the integration test, I need to write an application to simulate this. Is there any way in ASP.NET where I can redirect to another web-page and pass a custom HTTP header in the process?

View 3 Replies

Response - Get Custom Http Header?

May 14, 2010

I have an appliction on the one server. There I've added code on server-side in Page_Load:

Response.AddHeader("key", "password-key-from-hotel");

On the client side I have a form:
<form ... action="" >
<input type="hidden" id="asd" value="fgh" >
<script type="text/javascript">

Then on the other domain - there is also my other application - I'm trying to get the hedaer "key" by this code:


But there is no such header. Is there is a desicion? Where is my mistake?

View 2 Replies

IIS7 Rewrite - Strip HTTP Header?

Apr 1, 2010

Is it at all possible to use IIS7's rewrite capability in web.config to strip a particular HTTP header from a client request?We have an application that makes an HTTP POST to our website, and apparently the request contains the HTTP Expect header. Previously this was not a problem, but we've switched hosts and now the site is returning HTTP error 417 Expectation failed. So the real solution is to fix the software so it doesn't send the Expect header, but that can't happen soon enough for the folks in charge, who'd like to come up with an immediate web-based fix.I've used ISAPI_Rewrite before and I've read that it can strip a header, and the new host claimed they had ISAPI installed... but that seems to have been a lie, as I cannot get it to work, and support's only response on the subject is "use IIS7 Rewrite instead."

View 2 Replies

AJAX :: Add Http Header When Use Call Web Service?

Aug 4, 2010

I have one ajax call web service, and want to add some http headers using javascript, can we do that use setrequestheader in ms ajax?This is my javascript



View 3 Replies

C# - Adding A Http-Header In A HttpModule And Read It Out From A Page

Oct 6, 2010

I've tried to write my own HttpModule (IHttpModule) that adds a Header like that:

public class MyModule: IHttpModule
public void Init(HttpApplication c)
c.BeginRequest += delegate{c.Response.AddHeader("MyHeader", "MyValue");};
public void Dispose(){}

and tried to read in a aspx page like that:

var x = Request.ServerVariables["MyHeader"];

View 1 Replies

HttpHandlers / Modules :: How To Read The Custom Http Header

Jul 23, 2010

I have a very simple query. I have added custom header to my website. Now I want to read the custom header. I am using IIS 6.0 on windows XP. I have already tried using using the Request.ServerVariables and and Request.header method. But none of them give me the custom header added to website.

View 2 Replies

WCF / ASMX :: Read Http Custom Header From Web Service?

Oct 5, 2010

cant read http custome header "MSISDN" from my web service ... same code works on regular page. Can anyone shade a light on that subject ?

View 2 Replies

Http - Extract Header Info From A Get Request On A Remote URL?

Sep 10, 2010

I want to perform a get request on a remote URL and then extract the headers returned.

View 1 Replies

Can't Set HTTP Vary Header In IIS7 Classic Mode

Jan 16, 2010

First, a little background. I have written a custom HTTP compression module for ASP.NET. My development machine has Windows 7 Ultimate, which comes with IIS7. My production environment uses IIS6.

The problem I'm having is, Resource Expert Droid ( tells me that I need to add a header to my response to properly support compression: "Vary: Accept-Encoding"

On IIS7 in integrated mode, it works properly. However, in classic mode, which is how my application ultimately runs, I cannot get my code to output this header using any of Response.AppendHeader(), Response.Cache.SetVaryByCustom(), or Response.Cache.VaryByHeaders.

View 1 Replies

Copyrights 2005-15, All rights reserved