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The Webalizer is a GPL application that generates web pages of analysis, from access and usage logs, i.e. it is web log analysis software. It is one of the most commonly used web server administration tools. It was initiated by Bradford L. Barrett in 1997. Statistics commonly reported by Webalizer include hits, visits, referrers, the visitors' countries, and the amount of data downloaded. These statistics can be viewed graphically and presented by different time frames, such as by day, hour, or month. == Overview == Website traffic analysis is produced by grouping and aggregating various data items captured by the web server in the form of log files while the website visitor is browsing the website. Some of the most commonly used website traffic analysis terms are listed below: * URL - A Uniform Resource Locator (URL) uniquely identifies the resource requested by the user's browser. * Hit - Each HTTP request submitted by the browser is counted as one hit. Note that HTTP requests may be submitted for non-existent content, in which case they still will be counted. For example, if one of the five image files referred by the example page mentioned above is missing, the web server will still count six HTTP requests, but in this case, five will be marked as successful (one HTML file and four images) and one as a failed request (the missing image) * Page - A page is a successful HTTP request for a resource that constitutes primary website's content. Pages are usually identified by a file extension (e.g. .html, .php, .asp, etc.) or by a missing extension, in which case the subject of the HTTP request is considered a directory and the default page for this directory is served. * File - Each successful HTTP request is counted as a file. * Visitor - A visitor is the actual person browsing the website. A typical website serves content to anonymous visitors and cannot associate visitors with the actual person browsing the website. Visitor identification may be based on their IP address or an HTTP cookie. The former approach is simple to implement, but results in all visitors browsing the same website from behind a firewall counted as a single visitor. The latter approach requires special configuration of the web server (i.e. to log HTTP cookies) and is more expensive to implement. Note that neither of the approaches identifies the actual person browsing the website and neither provides 100% accuracy in determining that the same visitor has visited the website again. * Visit - A visit is a series of HTTP requests submitted by a visitor with the maximum time between requests not exceeding a certain amount configured by the webmaster, which is typically set at 30 minutes. For example, if a visitor requested page A, then in 10 minutes page B and then in 40 minutes page C, then this visitor has generated two visits, one when pages A and B were requested and another when the page C was requested. * Host - In general, a host is the visitor's machine running the browser. Hosts are often identified by IP addresses or domain names. Those web traffic analysis tools that use IP addresses to identify visitors use the words hosts, domain names and IP addresses interchangeably. * User Agent - User agent is a synonym for a web browser. In order to illustrate the difference between hits, pages and files, let's consider a user requesting an HTML file referring to five images, one of which is missing. In this case the web server will log six hits (i.e. one successful for the HTML file itself and four for successfully retrieved images and one for the missing image), five files (i.e. five successful HTML requests) and one page (i.e. the HTML file). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Webalizer」の詳細全文を読む スポンサード リンク
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