HttpHandlers / Modules :: ASHX Doesn't Work When Uploaded To Server?
Nov 28, 2010
I have a 3.5 app with a subfolder containing numerous documents. I want to control access to all files in this subfolder via an ASHX handler. My file system looks like this:
The content of the web.config in the files folder is simple:
[Code]....
This works fine on my WinXP / IIS6 developement box, but doesn't work at all when I upload it to my IIS7 / shared hosting account (GoDaddy). I know it doesn't work because I can access every file in the subfolder - the restrictions I wrote in my ASHX code-behind aren't taking affect at all.
According to MSDN documentation, this is supposed to set the Cache header "Expires" to a certian value. A check of fiddler for the response from my handler indicates the Expires is being ignored. Is this a known bug? I see other posts where people have just given up with out an answer.
I have a gridview and in it is code to display an image
[Code]....
This works fine for pass one variable. but I need to send two variables 'ImageNum' and 'refID' to the Handler.ashx page, any ideas how, tried a few things in last few hours and as yet no joy!
Is it possible to add a messagebox to an ASHX Handler? I used a handler to pass data from a Web Service to an internal system and need a messagebox to pop up to ask the user to choose from one option or another.
I have an Handler.ashx file and on .aspx page load it calles the .ashx file for image reading. I am attempting to pass a session from the .aspx file to the .ashx file in order to make my query of grabing the image secure. The problem is that everytime I call a session: HttpContext.Current.Session["ID"], the value is returning null or errors saying the o so commong "Object reference not set to an instance of the object". I have tried a couple ways of grabing the session:
none of them are giving me the ID session set in the .aspx page. should i be using Server.Transfer instead? is there a way to grab a session variable set in a .aspx page and called in a .ashx page?
i have doubt i have a .ashx file is in project called ShowImage.ashx,Currentely i am using this file for to show to show images in uploading area used to immediately show image after uploading it to the uploader on the web page
but now i want to pass the user id containg textbox value to this .ashx file(it is an int Value not string) how can ito send my textbox int values to .ashx file and receive the result
I have read in many places that referencing IRequiresSessionState or IReadOnlySessionState will allow me access to the Session scoped variables from within the ProcessRequest method in an ASHX file.
I have implemented these changes, as follows, and I am unable to retrieve this data still, as the server returns a null object reference error:
using System; using System.Web; using System.Web.SessionState;[code]....
The error is most certainly specific to pulling data from the session, yet I am 100% certain that the session contains data in this key.
It shouldnt matter where I am storing the data (cookies, vs db, etc), right?
I am having a specific requirement of which I am not sure it is even possible to do but I have read somewhere in the past few days that similar to what I am trying to achieve shoud be done by writing a custom HttpHandler (or module?). Basically, I currently have a simple aspx page that accepts a file upload and forwards it to another URL (after doing some checking). The way this currently works is that my Page_Loaded gets called only after the entire file is uploaded.
What I am looking to achieve is get a hold of an uploaded file Stream early on as soon as request headers are processed so I could do some sort of piping froim the uploaded file Stream to my destination Stream. With large files this should be extra beneficial because there is no waiting time for the large file to get uploaded and my gut feeling tells me this way the memory footprint should also be lower. What I need is a forward-only Stream. No seeking needed. Therefore, I don't need to manage the entire uploaded file at some point in time. I just want to send the bytes as soon as they are received (with some lightweight processing in between).
It is good experience by reading posts/discussions so im asp.net programmer i need the knowledge of how to work with http handlers? Where can we use them and what are exact scenarios in our requirement?
i manage the doc extension through a customized HttpHandler :
I set <add verb="GET" path="*/*.doc" type="MOMA.IWT.Framework.Portal.Components.HttpHandler.ResourcesHandler, PortalComponents" /> in the httpHandlers section of the web.config file and in IIS property i add a mapping for .doc with C:WINDOWSMicrosoft.NETFrameworkv2.0.50727aspnet_isapi.dll
So, when i try to get a file named like pippo.doc within my web application [URL) my handler intercept the request, all right but when i try to get [URL]the result is 400 bad request My question are: why the handler doesn't intercept the request? How can I open the pippo..doc document?
am trying to write an HttpModule that will work in IIS7 with integrated pipeline mode AppPool. Within this module I need to access Session variables and to be able to capture the Session Start and End events. I have found a couple of articles on this topic that indicate the need to modify the behavior of the HttpHandler in PostAcquireRequestState to force the Session for the context to be initialized. The article I am using as a template is posted here:[URL]In my case I am getting the following error:
[NullReferenceException: Object reference not set to an instance of an object.] System.Web.PipelineModuleStepContainer.GetEventCount(RequestNotification notification, Boolean isPostEvent) +30 System.Web.PipelineStepManager.ResumeSteps(Exception error) +1112 System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) +113 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +616
I believe that this error implies a problem with attempting to attach an event handler multiple times. I am aware that the modules Init function can be called more than once and have set a static initialization flag which ensures that I will only ever attach the event handler once.In the most condensed form my code is as follows:
public class HttpModule : IHttpModule, IRequiresSessionState
It works fine with IIS 7.0 on localhost but when i upload my site and try to access the rules written for url rewrite it gives me error message of 404 ..
here is my web.config file the require changes for Windows server 2003 IIS 6.0
I need to access image files (.jpg) on a server other than the web server my app runs on. I would like to use an httphandler to do this but I am unsure of the syntax to specify the path. I have tried mapping a drive on the web server to the file server but that didn't work. I have tried using a UNC path but that did not work either.
I am in a situation where i need to design a mechanism where i want my server to access files from a file server. There's gonna be another desktop application who will be talking to this file server.
I want to send a file by converting it into binary file to the client end and then it should be read by javascript which again I am passing to the OCX method.(like my OCX method accept only the binary data so i have to transmit binary data from server side to client).
I want the rewrite url to work on the virtual dedicated server. so when someone enters the url without extension like http://megafastline.com/feedback , it shud display the contents of the page feedback.aspx
The code work perfectly fine in the localhost, but when i uploaded this on the godaddy dedicated virtual server and hit http://megafastline.com/feedback , i m getting
URL rewrting is not working when I shift the site from windows 2003 to 2008 server i.e from IIS6 to IIS7.I added the aspnet_isapi.dll to Handler Mapping. still it is not working. showing me page not found 404 error.
This is kind of cross-post; however, can a custom http handler be automated to run either using a timer or a filesystemwatcher to post an xml document to another server (with no human interaction)?
