Waiting on a mutex or monitor e. Spinning in a loop If any of the above stop the event loop from doing anything else for a significant amount of time then you should go immediately to the naughty step, and await further instructions. How long is a piece of string? It really depends on your application and the amount of concurrency you require.
A related article has been written, Creating Expiring Web Pages. This article's impetus was based on a real-world application I worked on recently that involved the need for one site to be able to send users to a partner site, sending along authentication information.
Specifically, the first site Site A needed to be able to generate a URL that its users would click to take them to a partner site Site B.
Site A and Site B, then, worked together to define precisely what set of tamper-proof parameters would need to be passed and in what order. The approach discussed in this article is a slightly more generalized and simplified look at the solution used in my project.
This approach is less than ideal if you're wanting to create an entire site where all links are tamper-proof.
For example, the code in this article is sensitive to the ordering and the set of tamper-proof querystring parameters; ergo, both the sending and receiving page must agree upon these tamper-proof parameters and their ordering, which can be prohibitive. An upcoming article will discuss are more generalized approach for creating truly tamper-proof URLs, ones that do not require the receiving and sending page to agree upon the set of tamper-proof querystring parameters.
Introduction One of the unique challenges of building Web applications lies in way by which a Web application can be "invoked" by an end user. With traditional desktop applications, there is typically a very stringent set of ways the application can be invoked - by running a particular executable, perhaps passing in a set of command-line parameters.
With Web applications, however, there are, possible, an infinite number of ways that the application can be invoked. With a Web application, each Web page serves as a public interface to the Web applications, and for Web pages whose functionality is based on user-supplied parameters i.
Having a potentially unlimited number of public interfaces greatly increases the complexity and forethought required in building secure and consistent Web applications. Since URLs can easily be changed by even the most novice user, it is paramount that you do not place any state information in the querystring that you do not mind the user change, or, if you do, you need to validate in the web page's code to ensure that the user has not modified the querystring to an unacceptable state.
For example, imagine that you had a website with a page where a user could modify their account. However, there are times where important state needs to be passed through the querystring and, under no circumstances, should be it be able to be modified by the end user.
We'll discuss some of these cases in more detail further on in this article. Such tamper-proof URLs can be created quite easily by using a one-way hash to sign the querystring parameters that you do not want edited and appending that signature to the querystring.
The web page being visited, then, can apply the same hash to the plain-text querystring parameters and ensure that it matches up to the signature included in the querystring.
If the two signatures match, then the querystring parameters have not been modified. In this article we'll look at how to use one-way hashes to create tamper-proof URLs.
As we'll see, only a few short lines of code are needed to both generate the signature on the page generating the hyperlink and validating the signature on the "receiving" page. Read on to learn more!
For example, if you have a site that has a page called ShowProduct. Even if you only create links on your site that have the valid ProductID value in the querystring, a user could easily modify the querystring parameters in an attempt to view products they don't have rights to view.
In cases where you can do validation of input parameters in the source code, you don't need to worry about creating tamper-proof URLs. After all, if the end user does tamper with the URL, you'll catch it and can respond accordingly. However, there are real-world scenarios where you may not be able to perform validation of the input parameters.
Returning to our ShowProducts. But what if you want to be able to give users without an account on your site a "sneak peak" into various products, and you didn't want to just limit them to a pre-defined subset of products, but be able to give a sneak peak to any product at any time?
Here we have a sort of chicken and egg problem: To solve this problem we can allow anyone in to ShowProducts. Another use for tamper-proof URLs is to limit the duration a particular resource can be accessed.
|Uses for Tamper-Proof URLs||What kind of performance hit is there with the software loaded? Performance statistics for IIS Website withhits per day.|
|asp classic - Display MessageBox in ASP - Stack Overflow||Click on Change to use the new Code Type and continue, Ignore to continue compression without changing the Code Type, or Cancel to abort so you can manually change your selection and adjust other settings. Choosing the correct Code Type makes the compression of your code more safe and effective.|
|In the beginning there was Vert.x||Waiting on a mutex or monitor e.|
|Flicks Software's FAQ BBBB||What kind of performance hit is there with the software loaded? Performance statistics for IIS Website withhits per day.|
For example, imagine that you have a website that you charge customers a monthly fee to use.IN order to Show MessageBox you can add the MessageBox Class in your page and use webkandii.com("Your Message");. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site.
Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site.
We’ve already had a glimpse at Server-Sent Events (also known as EventSource †, and I’ll switch between the two to keep you on your toes) in my Methods of Communication article from last year. In this article, I want to delve in to more detail about the SSE API, demonstrate its features, and.
I am new to code and starting with ASP. How do I create a simple message box so I can alert the users on the web page? Now that the XMLHTTP Request library is set to go, we are going to include a generic AJAX function I wrote, which you can reuse for most scenarios.