Browser Fires Request Twice To Image Handler?
Aug 5, 2010
I am working on a web application. Some images are calling a web provider, which renders the picture, and send it to the client (the html looks like img ... src="/WebProviders/ImageHandler.ashx?.../>).The problem I have encountered is that both IE8 and Firefox 3.6.8 fire the request to the handler more than once, yet not consistently. I could not trace a pattern (the same image sometimes cause one and sometimes several requests).
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Jun 23, 2010
I've got a simple ASHX handler that returns an dynamically generated image; the image is generated from a custom created class, and an object belonging to this class is passed to the handler using Session (I'd rather avoid using QueryString).The handler is used as the URL of an image on a ASP form which is very simple: a drop down list, a button and an image. Basically, depending on what the user selects from the list, the appropriate image will be generated once the button is pressed.
At the start the actual image has it's Visible property set to false; I don't want the handler to display anything before the data is all there.Once the button is pressed, the required Session parameter is added containing the necessary object, and the page is refreshed using Server.Transfer. When the Page_load method detects that the Session parameter has been correctly set, it sets the Visible parameter on the image to true.After that the handler fires up and generates the image.
So far so good... However, if the user now picks something different from the list and presses the button, despite the correct object being passed in the Session, the image won't be updated. In fact, the handler won't even fire up (if I put a breakpoint in there). I need to close the browser window and reopen it for it to work.Any ideas what could be the cause of such behaviour?I suspect the answer is very simple, and I just don't know something fundamental about ASP (or handlers)...
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Jun 3, 2010
I have noticed that when I have a session that has expired, the Session_OnStart event fires with every new request.
I suppose that this behavior is not normal, because I was expecting that the session would re-start only with the first request and not with every subsequent request.
This behavior occurs only with sessions where the timeout period has been exceded.
The current conditions under which I have experienced this problem are:
I have experienced this problem with an application that is using the .NET 2.0 framework and with a session mode configured to InProc. This problem is happening both on Windows XP SP3 and Windows 2003 Server.
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Jul 15, 2010
I have:<asp:TextBox ID="Profile_EMail" runat="server" CssClass="form" />
and
<asp:RegularExpressionValidator ID="Validator_Profile_EMail"
runat="server" ControlToValidate="Profile_EMail"
meta:resourcekey="Validator_Profile_EMail"
ValidationExpression="w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*">
on my ASP.NET form.
When user uses browser embedded autocomplete list and selects any element by pressing "Enter" button, validator fires. Always validation is not passed. Email pattern is proper. When user press "save" button, validation passes correctly.
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Mar 18, 2013
I need displaying my image file stored from my database into the image control. I've had read some articles and watch video tutorial which there were perfectly working and I followed it but I wasn't able to make it work. The image control just displayed blank. I used Generic Handler to retrieve the image file from my database based on the articles and tutorials I've got. here are my codes below:
Generic Handler:
Code:
<%@ WebHandler Language="C#" Class="ShowImage" %>
using System;
using System.Configuration;
using System.Drawing;
using System.Drawing.Imaging;
[Code] ....
Asp.Net Code for the Image control:
HTML Code:
<asp:Image ID="Image1" runat="server" ImageUrl='<%# "ShowImage.ashx?ID=" + Eval("ID") %>' Height="128px" />
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Jun 24, 2010
I have a webpage where I am displaying some data.
On the top of that I have a button. On click of this button I am calling my webhandler using jquery/json, passing in some data to this handler. Now this data can containg html tags. So whenever I try to click that button it gives that Potential threat script
error. So I thought let me include ValidateRequest = false to my webpage.
Now when i do this it never hits my handler. I tried to debug also but my breakpoint is never hit in my handler. How to handle this.
This is how I call my handler:
[Code]....
where hidden value is the value which I want to pass to my handler and may contain html tags..
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May 19, 2010
Is it possible to call a handler using javascript code? e.g. i have a handler deployed at this location http://mysitename.com/getMyData.ashx. Can I call this handler or just request it using javascript?
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Mar 30, 2010
I have a new virtual server, subsite. but I get the feeling I may be still be inherting from the root config! Even though I have included <clear/> within both the <connectionString> and <httpModules>.
The main website works (web1) along with one of the subsites (web2) however the 3rd subsite (web3) gives the below error.
e.g.
http://web1
http://web1/web2
http://web1/web3
Gives the following error :
No http handler was found for request type 'GET'
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: No http handler was found for request type 'GET'
Source Error:
[Code]....
Stack Trace:
[Code]....
Version Information: Microsoft .NET Framework Version:2.0.50727.3603; ASP.NET Version:2.0.50727.3082
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Sep 15, 2010
I am getting following error in production but the same is not a repro in in local.
> Error executing child request for
> handler
> 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerWrapper'.
> Inner Exception: Exception of type
> 'System.Web.HttpUnhandledException'
> was thrown.
Stack Trace:
[code]....
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Mar 2, 2011
[Code]....The WebResource.axd handler must be registered in the configuration to process this request?
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Jun 18, 2010
I have created a chart control webpart and trying to deploy onto sharepoint2010 page. I am able to add the standard webparts. When it comes to the webparts related to chartcontrols I get the following error.
no http handler was found for request type 'get'.
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Jan 5, 2011
Basically I have a web site that renders HTML preview of some documents (mainly office). The resulting HTML fragment is included in the page returned by the same web site, however images are returned by HTTP handler from another site with the following links:
<img width="50" height="50" src="http://portal/Service/GetFile.asxh?id=123&inline=true">
For some reason all browsers except Chrome (e.g. IE6/7/8, Firefox, Opera, Safari) show everything just fine, however for these images Chrome shows "broken image" icon. If I choose "Open image in new tab" then the image is shown just fine.
Edit I thought I have solved this issue, but apparently with Fiddler turned on it works fine.
I had context.Response="utf-8" left in code, but removing it had no difference.
Headers:
HTTP/1.1 200 OK
Date: Wed, 05 Jan 2011 14:26:57 GMT
Server: Microsoft-IIS/6.0
MicrosoftOfficeWebServer: 5.0_Pub
[Code]....
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Dec 6, 2010
I'm using a slightly modified version of Valum's upload [github link], I've modified it to upload to a database but haven't modified the javascript that it is using to get the file into the Request as an InputStream. The following line of code is failing in IE 8 but is confirmed to work in Chrome. using (Image imgInput = Image.FromStream(Request.InputStream)) The error received is "Parameter not valid". It appears to be having an issue with the Input Stream being used but it exists/has data (not sure how to validate if the data is good or not).
Page
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>Upload-Pictures</h2>
<div id="file-uploader">
<noscript>
<p>Please enable JavaScript to use file uploader.</p>
</noscript>
</div>
<script src="/Scripts/fileuploader.js" type="text/javascript"></script>
<script type="text/javascript">
function createUploader() {
var uploader = new qq.FileUploader({
element: document.getElementById('file-uploader'),
action: '/Admin/FileUpload/' + <%= Model.PropertyId %>,
debug: true
});
}
window.onload = createUploader;
</script>
</asp:Content>
Controller
[AcceptVerbs(HttpVerbs.Post)]
public JsonResult FileUpload(int id)
{
try
{
byte[] newImageByteArray = GetByteArrayForResizedImage(350, Request.InputStream);
byte[] thumbnailByteArray = GetByteArrayForResizedImage(150, Request.InputStream);
//Add to DB
}
catch (Exception ex)
{
// This is where the exception is caught
return Json(new { success = false, message = ex.Message }, "application/json");
}
return Json(new { success = true }, "application/json");
}
private static byte[] GetByteArrayForResizedImage(int imageSize, Stream inputStream)
{
byte[] imageByteArray;
// For some reason in IE the inputStream here is causing it to crash
using (Image imgInput = Image.FromStream(inputStream))
{
//Image processing
}
return imageByteArray;
}
fileuploader.js - qq.FileUploader
/**
* Class that creates upload widget with drag-and-drop and file list
* @inherits qq.FileUploaderBasic
*/
qq.FileUploader = function(o){
// call parent constructor
qq.FileUploaderBasic.apply(this, arguments);
// additional options
qq.extend(this._options, {
element: null,
// if set, will be used instead of qq-upload-list in template
listElement: null,
template: '<div class="qq-uploader">' +
'<div class="qq-upload-drop-area"><span>Drop files here to upload</span></div>' +
'<div class="qq-upload-button">Upload a file</div>' +
'<ul class="qq-upload-list"></ul>' +
'</div>',
// template for one item in file list
fileTemplate: '<li>' +
'<span class="qq-upload-file"></span>' +
'<span class="qq-upload-spinner"></span>' +
'<span class="qq-upload-size"></span>' +
'<a class="qq-upload-cancel" href="#">Cancel</a>' +
'<span class="qq-upload-failed-text">Failed</span>' +
'</li>',
classes: {
// used to get elements from templates
button: 'qq-upload-button',
drop: 'qq-upload-drop-area',
dropActive: 'qq-upload-drop-area-active',
list: 'qq-upload-list',
file: 'qq-upload-file',
spinner: 'qq-upload-spinner',
size: 'qq-upload-size',
cancel: 'qq-upload-cancel',
// added to list item when upload completes
// used in css to hide progress spinner
success: 'qq-upload-success',
fail: 'qq-upload-fail'
}
});
// overwrite options with user supplied
qq.extend(this._options, o);
this._element = this._options.element;
this._element.innerHTML = this._options.template;
this._listElement = this._options.listElement || this._find(this._element, 'list');
this._classes = this._options.classes;
this._button = this._createUploadButton(this._find(this._element, 'button'));
this._bindCancelEvent();
this._setupDragDrop();
};
fileuploader.js - qq.FileUploaderBasic
/**
* Creates upload button, validates upload, but doesn't create file list or dd.
*/
qq.FileUploaderBasic = function(o){
this._options = {
// set to true to see the server response
debug: false,
action: '/server/upload',
params: {},
button: null,
multiple: true,
maxConnections: 3,
// validation
allowedExtensions: [],
sizeLimit: 0,
minSizeLimit: 0,
// events
// return false to cancel submit
onSubmit: function(id, fileName){},
onProgress: function(id, fileName, loaded, total){},
onComplete: function(id, fileName, responseJSON){},
onCancel: function(id, fileName){},
// messages
messages: {
typeError: "{file} has invalid extension. Only {extensions} are allowed.",
sizeError: "{file} is too large, maximum file size is {sizeLimit}.",
minSizeError: "{file} is too small, minimum file size is {minSizeLimit}.",
emptyError: "{file} is empty, please select files again without it.",
onLeave: "The files are being uploaded, if you leave now the upload will be cancelled."
},
showMessage: function(message){
alert(message);
}
};
qq.extend(this._options, o);
// number of files being uploaded
this._filesInProgress = 0;
this._handler = this._createUploadHandler();
if (this._options.button){
this._button = this._createUploadButton(this._options.button);
}
this._preventLeaveInProgress();
};
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Jul 10, 2013
<asp:Image ID="aspImagePreview" runat="server" AlternateText="Preview" Height="190px" Width="290px" ImageUrl="~/file1.jpg" />
when the file file1 has been changed or removed. How can I do one refresh to the item to make it reflect the recent change?
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Apr 13, 2010
I am using a backgroundimage in a <div>. The image itself has the dimensions 1246 * 1488.
I have set the div property to the same size in the .css file: 1246 * 1488
In the image I have some written text. But now when I open this up in the browser, the image is a bit wider wich makes this text "Blurry"
I wonder why this image is getting bigger in the browser:
[Code]....
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Mar 24, 2010
To prevent duplicate requests (i.e. pressing F5 right after clicking a command button), I've setup my page base class to ignore the request if it's detected as a duplicate.
When I say 'ignore' I mean Response.End()
Now I thought I've seen this work before, where there's an issue, I just Response.End() and the users page just does nothing. I don't know the exact circumstance in which this worked, but I'm unable to repeat it now.
Now when I call Response.End(), I just get an empty browser. More specifically, I get this html.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=utf-8"></HEAD>
<BODY></BODY></HTML>
I setup the following test app to confirm the problem is not elsewhere in my app. Here it is:
Add the following to an aspx form
<asp:Label ID="lbl" Text="0" runat="server" /><br />
<asp:Button ID="btnAdd1" Text="Add 1" runat="server" /><br />
<asp:Button ID="btnAdd2" Text="Add 2" runat="server" /><br />
<asp:Button ID="btnAdd3" Text="Add 3" runat="server" /><br />
And here's the code behind file
using System;
namespace TestDupRequestCancellation
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Init(object sender, EventArgs e)
{
btnAdd1.Click += btnAdd1_Click;
btnAdd2.Click += btnAdd2_Click;
btnAdd3.Click += btnAdd3_Click;
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
CurrentValue = 0;
else if (Int32.Parse(lbl.Text) != CurrentValue)
Response.End();
}
protected void Page_PreRender(object sender, EventArgs e)
{
lbl.Text = CurrentValue.ToString();
}
protected int CurrentValue
{
get
{
return Int32.Parse(Session["CurrentValue"].ToString());
}
set
{
Session["CurrentValue"] = value.ToString();
}
}
void btnAdd3_Click(object sender, EventArgs e)
{
CurrentValue += 3;
}
void btnAdd2_Click(object sender, EventArgs e)
{
CurrentValue += 2;
}
void btnAdd1_Click(object sender, EventArgs e)
{
CurrentValue += 1;
}
}
}
When you load the page, clicking any button does what is expected, but if you press F5 at any time after pressing one of the buttons, it will detect it as a duplicate request and call Response.End() which promptly ends the task. Which leaves the user with an empty browser.
Is there anyway to leave the user with the page as it was, so they can just click a button?
Also; please note that this code is the simplest code I could come up with to demonstrate my problem. It's not meant to demonstrate how to check for dup requests.
EDIT: Another change that will allow me to achieve the same results would be to disable all my event handlers.
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Mar 11, 2011
The Request.Browser.Cookies property (of type bool) attribute stores information whether client's browser supports cookies and whether or not they are enabled.How reliable is the property Request.Browser.Cookies? Is it guaranteed to be correct ? Or should I rather implement redirection technique suggested by Software Monkey in this question?Please note: This in not a question "are cookies reliable" ? This is a question: "Is the information whether users browser accepts cookies reliable?"
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Dec 16, 2010
I'm using httpwebrequest but I have a problem when I execute the codes. Like this..in title english = browser not supported. how can I skip this protection
this is a facebook protection.
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Dec 29, 2010
v4 NET framework / ASP.NET
I am trying to retrieve an image created by a handler. Here is the code for the handler:
[Code]....
Here is how i call it from an aspx file:
[Code]....
The image is missing from the webpage generated.
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Feb 9, 2010
I'm trying to using a Generic Handler to retrieve and display images that are stored in a database.
But its just not working. Ive tried verious of the code below, but I cant seem to get it to work.
<%@ WebHandler Language="C#" Class="IconsDb" %>
using System;
using System.Web;
using System.Linq;
using System.Data.Entity;
[Code]....
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Jan 22, 2010
I tried to install MSCharts on my Win2008 server. It installed without problem. Then I wrote in configBut when I'm trying to open page with charts it returned following error.No http handler was found for request type 'GET'Do you have any thougths about the problem?
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Apr 9, 2010
I am working with three machines. The printer is shared and it is attached to one machine. Second machine contains published pages and on third machine I am developing the application. I have an application which uses combit's list & label for label printing. I am able to print label from the project. Means while debugging the project, printing works fine without any problem(from the development machine). But when I deploy(publish) this project in IIS by making virtual directory and then try to run, it does not work(on deployment machine). The browser freezes and does not show any error as well. After closing browser and running the same page takes a lot of time just to load the page.(not even shows the complete GUI, just white page...) Eventually I have to restart the IIS. Does anybody have idea regarding this?
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Feb 11, 2010
In my MSSQL Server I have a table named Nomogram including an attribute named Img1 which include an image of type varbinary(MAX)I wish to load that image on my webform using an http-handler (ashx).How do I do that? I have looked at this sample but I can figure it out how to solve my exact problem. [URL]
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Jul 25, 2010
I've created code to retrieve an image from the file system using an ASHX handler. The code displays the image correctly in Chrome, but I get a broken image in IE:
[Code]....
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Sep 30, 2010
I have created an ashx handler to render image thumbnails from images in a mysql database. If a file name is passed through querystring, the content disposition filename is set (when user clicks "save as..." the filename appears). The images appear properly and the filename appears when user selects "save as..." but the filetype is listed as unknown and the file that downloads has no type. I have tried adding ".jpg" to the end of the filename in content disposition for lack of anything else to try, but this made every image download as untitled.bmp.
[Code]...
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