Site Monitoring

Configuring web page checks

Scheduler - Page Monitoring checks

You have the option of just checking to see whether a page is present (fetching page header information only) or read the whole page and analyse it, You can also monitor for changes to the page

Perhaps less frequently (once a day or once a week) you may want to check that a page's links are all accessible. This allows you to spot the dreaded 404 error for both internal and external links.

The checks on the page allow you to :

Check page Header onlyThe header only option just checks that the page is present, it does not attempt to read the information in the page. The access time will reflect latency of accessing the server.
Read the pageThe whole page (typically .htm or .html file) is read from the server. The access time will account for the speed of reading the page.
Check internal linksThe whole page is read and the time taken to read it. After it has been downloaded the page is scanned for links to other pages on the same web site and these are checked for presence on the server. If the page has several links to the same page, these are checked only once. This also checks referenced to HTML Frames within the site. You should perform this check relatively infrequently.
Check all linksThe whole page is read and the time taken to read it. After it has been downloaded the page is scanned for links to all other web pages (internal and external). This also checks referenced to any HTML Frames used in the page. You should perform this check relatively infrequently.
Check all links and graphicsChecks all the links but also checks accessibility of all graphics files referenced by the page. You should perform this check infrequently.
Raise alert when the page changesChecks whether the page content has changed by comparing checksums with the previous content of the page. This will alert you if a page gets infected by a virus. You can look at the changes made by setting the number of archived copies you want to keep. Once the page changes you can compare the changes that have been spotted. Setting the value to zero means that a page change alert is generated but copies of the page data will not be kept.
Raise alert when the host's IP address changesChecks whether the DNS entry for a web site address has changed. This will alert you if your web site has moved to a different server.
Detect internal consistency and correctness of the page dataChecks that the HTML for the page conforms to the strict HTML4 rules. Raises an alert if significant problems are found. The Analyzer can be used to investigate any problems.
Raise alert when web page contains specific textCheck the page contains or does not contain specific text. You can use this to spot error messages in generated pages. Press Settings to configure this option.

The maximum access time field allows you to be made aware if a page is taking longer than it should do to load. Although SiteVigil can not easily determine why it might take so long (it may be Internet congestion) you will be made aware of possible problems. It is a good idea to monitor multiple independent web sites so that you can isolate problems relating to the server from that of the local connection.

To complete the changing of an existing monitor press OK to save the changes made. Cancel closes the dialog losing any changes you may have made.

Use the tabs at the top of the property sheet to display information about the selected page monitor :Settings, Statistics, Events, Data and Archive.

See also : Uniform Resource Locators (URL), Exploring web sites to monitor with SiteVigil, Spotting changes to pages and resources

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