Webseal junction options trading hours

Programming techniques and paradigms that are utilized in Web development are changing webseal junction options trading hours. Before proceeding however, this article provides a brief introduction and review of the relevant WebSEAL concepts. The role of a reverse proxy is to provide a centralized point to receive HTTP requests on behalf of a back-end Web server.

This generally requires that the URL be re-written in order to make sense to the Web server. The re-written request is then sent on to the back-end server. View image at full size. The second point where the reverse proxy acts as a mediator is by filtering the response from the back-end Web server to replace all URLs to include the junction details see Figure These rules vary depending on the type of junction deployed in the environment. The following sections address each type of URL.

Relative URLs are always handled appropriately by the browser. The rewrite-absolute-with-absolute parameter determines if the absolute URL is used. For the purpose of this article, an AJAX webseal junction options trading hours is assumed to be any technique that uses asynchronous requests made to a remote system using client side JavaScript. As such, other potential issues that might arise when using plain text response data are addressed by this article. There are two mainstream technologies used webseal junction options trading hours perform AJAX requests: Basic operations, instantiating an object, issuing a request, and processing the response, are outlined in listingsrespectively.

This is non-blocking and provides an alternative way to load content asynchronously without webseal junction options trading hours the XMLHttpRequest object. An example of each issue is provided, along with a potential solution. The exact solution cannot always be given, because the environment specifics might need to be considered.

In normal operating conditions, if a session expires because of a timeout, the user is redirected to the login page when they next request a protected page. Upon the successful login they are redirected to the requested Web context. If AJAX is the mechanism utilized to make the request, then the login form will be contained within the AJAX response object and most likely the redirection will fail.

Similarly if a maximum number of concurrent sessions policy is enabled, problems arise when AJAX is the driving mechanism behind the request. The concurrent session policy limits the maximum number of sessions a user can have open at a single time. Depending on the configuration settings, WebSEAL will ask the webseal junction options trading hours whether they webseal junction options trading hours to displace an active session or simply terminate the other sessions without user intervention.

If prompting session displacement is enabled, the user performing the displacement is not redirected to the displacement page. In both instances, if the next request made by the displaced user is done via AJAX, there is a strong chance that the user will not be correctly notified regarding the displacement.

In webseal junction options trading hours operating conditions, a user's browser will handle this type of response in an acceptable manner. That is, redirect to the appropriate login form or error message. However when the redirect returned by WebSEAL is concealed within the XMLHttpRequest object, this redirection does not occur, and therefore the user is not notified in an acceptable manner as to why their last request has not been granted.

Potential solution This problem requires that the client be able to recognize when the response object is not in the expected format. If the client can detect this, they can effectively escalate the issue by passing control to the user agent. Listing 7 suggests a simplified solution to this problem. It involves making sure that the request returns a " OK" status and, if not, the browser is told to redirect to the original URL. In this instance if the user's session has expired the usery will be redirected to the login page.

Maintaining a persistent connection between a client and a Web server is becoming a popular technique in AJAX environments, although it is not specific to such environments.

The common reason for persistent connections and the non-traditional usage of HTTP is to simulate asynchronous communications from the server back to the client.

Applications might want to do this for functionality such as notifications or server status. When one of these connections times-out, the client attempts to immediately reconnect to the server. The implication of this for WebSEAL is that users with active sessions will be holding open at least one long-running connection to the server, in addition to the shorter connections that are generated from other user-initiated requests.

In extreme cases where a high number of active user sessions are anticipated, it might be necessary to add WebSEAL instances. Determine if there is an issue with the current setting of the [server] worker-threads parameter as configured in the WebSEAL configuration file.

The simplest method to determine if there is an issue is to use the WebSEAL statistics functionality. Specifically, monitor the output of the pdweb. The following example shows the output from a statistics get command webseal junction options trading hours the pdweb. If the reported webseal junction options trading hours of "active" is continually reaching the value of "total", you should make more worker threads available. Accessing protected objects from an unauthenticated or an account with lower privileges than required will return a login prompt or "HTTP " error, respectively.

A user agent such as the browser understands how to handle these scenarios; however, a typical client who is using AJAX as the requesting mechanism won't understand. It is quite feasible for a typical Web application that is publicly accessible to contain a link webseal junction options trading hours a Web object that is in a protected space. In this situation when an unauthenticated user clicks on the link, they will be redirected to the appropriate authentication mechanism. When they have authenticated, the decision can be made as to whether they are authorized to access this particular Web resource.

Again if AJAX is the underlying medium issuing the request when either an authentication or authorization decision needs to be made problems will ensue. These problems follow the same pattern as those described in the user session expiration section.

As the client side script is effectively acting as webseal junction options trading hours user agent browser in this scenario it needs to be able to handle webseal junction options trading hours response in a similar fashion. That is, notify the user that they need to authenticate to access the requested resource, and they have insufficient access to access this resource. The solution here again comes down to building in some intelligence into the client side application.

The ability for you application to perform under non-standard operating conditions is an important point for the Web application developer to consider.

An alternate approach could be to simply avoid using AJAX as the requesting medium in circumstances where an authentication or authorization decision is likely to be made. Regardless of the decision made here it is important for Web developers to keep this issue in mind when designing their applications. That is, the junction is created using the -j option. However a specific issue also exists for requests made with the XMLHttpRequest object, due to the webseal junction options trading hours origin policy that is enforced by the JavaScript language.

Consider the following scenario. If you turn on JavaScript filtering only, you won't get the desired effect. To get the content defined within an external JavaScript inspected, you need to use a configuration as follows:.

Another possible approach is to utilize virtual webseal junction options trading hours junctions, if this suits your existing infrastructure.

You will have a lot less issues when it is time to rewrite URLs within your client side scripts. However, virtual host junctions are not suitable for all deployments of WebSEAL within an enterprise, so it is really a matter of choosing what is best for your environment. When you create a WebSEAL junction using the -j option to enable junction cookies, special HTML code is inserted at the beginning or end of the HTTP response that sets the correct cookie path in webseal junction options trading hours browser the location determined by the -j option.

Generally, the returned page will look similar to that in Listing webseal junction options trading hours For example, an application might issue an AJAX request that calls a server-side function, expecting the result to be used later in the calling application. There are a number of possible scenarios where the server might return a response that is not what the Web application developer expected.

Among these are things previously addressed in this article such as session expiration. As the user's browser is already equipped to handle these situations, it makes sense to pass the control back to it for the best user experience. Use relative or absolute links where possible to avoid dead link issues.

This will result in dead links. When developing in such an environment, there are a number of potential issues that can arise without considering the technical requirements of a URL re-writing reverse proxy server, such as WebSEAL. This article highlights a number of potential issues that can be webseal junction options trading hours simply by following the outlined best practices.

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