An error message is information displayed when an unexpected condition occurs on a computer or other device. On modern operating systems with graphical user interfaces, error messages are displayed using dialog boxes. Error messages are used when user intervention is required, to indicate that a desired operation has failed, or to relay important warnings. Error messages are seen throughout computing, are part of every operating system or computer hardware device. Proper design of error messages is an important topic in usability and other fields of human–computer interaction; the following error messages are seen by modern computer users: Access denied This error occurs if the user has insufficient privileges to a file, or if it has been locked by some program or user. Device not ready This error most occurs when there is no floppy disk in the disk drive and the system tries to perform tasks involving this disk. File not found The file concerned may have been damaged, deleted, or a bug may have caused the error.
Alternatively, the file might not exist, or the user has mistyped its name. More frequent on command line interfaces than on graphical user interfaces where files are presented iconically and users do not type file names. Low Disk Space This error occurs. To fix this, the user should delete some files, or get a bigger hard drive. Out of memory This error occurs when the system has run out of memory or tries to load a file too large to store in RAM; the fix is to install more memory. Has needs to close. We are sorry for the inconvenience; this message is displayed by Microsoft Windows XP when a program causes a general protection fault or invalid page fault. In Windows 7 it is changed into a more simple " has stopped working". Abort, Fail? - A notoriously confusing error message seen in MS-DOS Bad command or file name - Another notoriously common and confusing error message seen in MS-DOS The Blue Screen of Death - On Microsoft Windows and ReactOS operating systems, this screen appears when Windows or ReactOS can no longer run because of a severe error.
It is analogous to a kernel panic on Linux, Unix or Mac OS X. Can't extend - an error message from Acorn DFS. DFS stores files in non-fragmented contiguous disk space, this error is caused when trying to extend an open random-access file into space, occupied by another file. Guru Meditation - an error message from the Commodore Amiga analogous to a kernel panic or Blue Screen of Death adopted by more recent products such as VirtualBox HTTP 404 - A file not found error seen on the World Wide Web resulting from a link to a page, moved or deleted, or a mistyped URL lp0 on fire - A Unix warning that the printer may be on fire Not a typewriter - A Unix error message, confusing due to its now obsolete use of the word typewriter, and, sometimes output when the nature of error is different PC LOAD LETTER - An error on several HP laser printers that asked the user to add "Letter" size paper in a confusing way SYNTAX ERROR - Seen on many computer systems when the received instructions are in a format they don't understand HTTP 504 - An error found on the World Wide Web stating that a gateway timeout occurred in the internet link.
Error 1603 - An error that states that a problem during installation of a computer program, this error occurs on Windows computer systems. <application name> has stopped - An error message found on Android devices, which states a current running application unexpectedly stops working or crashes. Success - one of the error messages that occurs when the program has detected an error condition, yet the actual error message printing routine relies on C library to print the error reported by the operating system, while the underlying system calls have succeeded and report no errors; this is a form of sloppy error handling, confusing for the users. With the rise of Web 2.0 services such as Twitter, end-user facing error messages such as HTTP 404 and HTTP 500 started to be displayed with whimsical characters, termed Fail Pets or Error Mascots. The term "Fail Pet" was coined, or at least first used in print, by Mozilla Engineer Fred Wenzel in a post on his blog entitled "Why Wikipedia might need a fail-pet — and why Mozilla does not."
Dr. Sean Rintel argues that error messages are a critical strategic moment in brand awareness and loyalty. Fail pets are of interest to marketers. "However, that same recognition carries the danger of highlighting service failure." The most famous fail pet is Twitter's Fail Whale. Other fail pets include: Ars Technica: Moon Shark FarmVille on Facebook: Sad cow. GitHub: Octocat Google: Broken robot iCloud: Cloud with Apple System 7 emoticon-style face Macintosh: Sad Mac Tumblr: Tumbeasts Twitter: Fail Whale / Twitter Robot YouTube: Televisions, light static inside video window Cartoon Network: BMO: Domo Google Chrome: T-Rex The form that error messages take varies between operating systems and programs. Error messages on hardware devices, like computer peripherals, may take the form of dedicated lights indicating an error condition, a brief code that needs to be interpreted using a look-up sheet or a manual, or via a more detailed message on a display
HTTP 403 is a standard HTTP status code communicated to clients by an HTTP server to indicate that access to the requested URL by the client is Forbidden for some reason. The server will not fulfill it due to client related issues. There are a number of sub-status error codes that provide a more specific reason for responding with the 403 status code. HTTP 403 provides a distinct error case from HTTP 401; this other reason needs to be acted upon before re-requesting access to the resource. Error 403: "The server understood the request, but is refusing to fulfill it. Authorization will not help and the request SHOULD NOT be repeated." Error 401: "The request requires user authentication. The response MUST include a WWW-Authenticate header field containing a challenge applicable to the requested resource; the client MAY repeat the request with a suitable Authorization header field. If the request included Authorization credentials the 401 response indicates that authorization has been refused for those credentials."
RFC2616See "403 substatus error codes for IIS" for possible reasons of why the webserver is refusing to fulfill the request. The Apache web server returns 403 Forbidden in response to requests for URL paths that correspond to file system directories when directory listings have been disabled in the server and there is no Directory Index directive to specify an existing file to be returned to the browser; some administrators configure the Mod proxy extension to Apache to block such requests and this will return 403 Forbidden. Microsoft IIS responds in the same way. In WebDAV, the 403 Forbidden response will be returned by the server if the client issued a PROPFIND request but did not issue the required Depth header or issued a Depth header of infinity The following nonstandard codes are returned by Microsoft's Internet Information Services and are not recognized by IANA. 403.1 - Execute access forbidden. 403.2 - Read access forbidden. 403.3 - Write access forbidden. 403.4 - SSL required 403.5 - SSL 128 required.
403.6 - IP address rejected. 403.7 - Client certificate required. 403.8 - Site access denied. 403.9 - Too many users. 403.10 - Invalid configuration. 403.11 - Password change. 403.12 - Mapper denied access. 403.13 - Client certificate revoked. 403.14 - Directory listing denied. 403.15 - Client Access Licenses exceeded. 403.16 - Client certificate is untrusted or invalid. 403.17 - Client certificate has expired or is not yet valid. 403.18 - Cannot execute request from that application pool. 403.19 - Cannot execute CGIs for the client in this application pool. 403.20 - Passport logon failed. 403.21 - Source access denied. 403.22 - Infinite depth is denied. 403.502 - Too many requests from the same client IP. 403.503 - Rejected due to IP address restriction.htaccess List of HTTP status codes URL redirection Apache Module mod_proxy - Forward /web/Hypertext Transfer Protocol: Semantics and Content
A web server is server software, or hardware dedicated to running said software, that can satisfy World Wide Web client requests. A web server can, in general, contain one or more websites. A web server processes incoming network requests over several other related protocols; the primary function of a web server is to store and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol. Pages delivered are most HTML documents, which may include images, style sheets and scripts in addition to the text content. A user agent a web browser or web crawler, initiates communication by making a request for a specific resource using HTTP and the server responds with the content of that resource or an error message if unable to do so; the resource is a real file on the server's secondary storage, but this is not the case and depends on how the web server is implemented. While the primary function is to serve content, a full implementation of HTTP includes ways of receiving content from clients.
This feature is used for submitting web forms, including uploading of files. Many generic web servers support server-side scripting using Active Server Pages, PHP, or other scripting languages; this means that the behaviour of the web server can be scripted in separate files, while the actual server software remains unchanged. This function is used to generate HTML documents dynamically as opposed to returning static documents; the former is used for retrieving or modifying information from databases. The latter is much faster and more cached but cannot deliver dynamic content. Web servers can be found embedded in devices such as printers, routers and serving only a local network; the web server may be used as a part of a system for monitoring or administering the device in question. This means that no additional software has to be installed on the client computer since only a web browser is required. In March 1989 Sir Tim Berners-Lee proposed a new project to his employer CERN, with the goal of easing the exchange of information between scientists by using a hypertext system.
The project resulted in Berners-Lee writing two programs in 1990: A Web browser called WorldWideWeb The world's first web server known as CERN httpd, which ran on NeXTSTEPBetween 1991 and 1994, the simplicity and effectiveness of early technologies used to surf and exchange data through the World Wide Web helped to port them to many different operating systems and spread their use among scientific organizations and universities, subsequently to the industry. In 1994 Berners-Lee decided to constitute the World Wide Web Consortium to regulate the further development of the many technologies involved through a standardization process. Web servers are able to map the path component of a Uniform Resource Locator into: A local file system resource An internal or external program name For a static request the URL path specified by the client is relative to the web server's root directory. Consider the following URL as it would be requested by a client over HTTP: http://www.example.com/path/file.html The client's user agent will translate it into a connection to www.example.com with the following HTTP 1.1 request: GET /path/file.html HTTP/1.1 Host: www.example.com The web server on www.example.com will append the given path to the path of its root directory.
On an Apache server, this is /home/www. The result is the local file system resource: /home/www/path/file.html The web server reads the file, if it exists, sends a response to the client's web browser. The response will describe the content of the file and contain the file itself or an error message will return saying that the file does not exist or is unavailable. A web server can be either incorporated in user space. Web servers that run in user-mode have to ask the system for permission to use more memory or more CPU resources. Not only do these requests to the kernel take time, but they are not always satisfied because the system reserves resources for its own usage and has the responsibility to share hardware resources with all the other running applications. Executing in user mode can mean useless buffer copies which are another handicap for user-mode web servers. A web server has defined load limits, because it can handle only a limited number of concurrent client connections per IP address and it can serve only a certain maximum number of requests per second depending on: its own settings, the HTTP request type, whether the content is static or dynamic, whether the content is cached, the hardware and software limitations of the OS of the computer on which the web server runs.
When a web server is near to or over its limit, it becomes unresponsive. At any time web servers can be overloaded due to: Excess legitimate web traffic. Thousands or millions of clients connecting to the web site in a short interval, e.g. Slashdot effect. A denial-of-service attack or distributed denial-of-service attack is an attempt to make a computer or network resource unavailable to its intended users.
A missing person is a person who has disappeared and whose status as alive or dead cannot be confirmed as their location and fate are not known. A person may go missing through a voluntary disappearance, or else due to an accident, death in a location where they cannot be found, or many other reasons. In most parts of the world, a missing person will be found quickly. While criminal abductions are some of the most reported missing person cases, these account for only 2–5% of missing children in Europe. By contrast, some missing person cases remain unresolved for many years. Laws related to these cases are complex since, in many jurisdictions and third parties may not deal with a person's assets until their death is considered proven by law and a formal death certificate issued; the situation and lack of closure or a funeral resulting when a person goes missing may be painful with long-lasting effects on family and friends. A number of organizations seek to connect, share best practices, disseminate information and images of missing children to improve the effectiveness of missing children investigations, including the International Centre for Missing & Exploited Children, as well as national centers, including the National Center for Missing & Exploited Children in the US, Missing People in the UK, Child Focus in Belgium, The Smile of the Child in Greece.
People disappear for many reasons. Some individuals choose to disappear alone. Reasons for non-identification may include: To escape domestic abuse by a parent/guardian/sibling/spouse. Leaving home to live somewhere else under a new identity. Becoming the victim of kidnapping. Abduction by a non-custodial parent or other relative. Seizure by government officials without due process of law. Suicide in a remote location or under an assumed name. Victim of murder. Mental illness or other ailments such as Alzheimer's Disease can cause someone to become lost or they may not know how to identify themselves due to long-term memory loss that causes them to forget where they live, the identity of family members or relatives, or their own names. Death by natural causes or accident far from home without identification. Disappearance to take advantage of better employment or living conditions elsewhere. Sold into slavery, sexual servitude, or other unfree labor. To avoid discovery of a crime or apprehension by law-enforcement authorities.
Joining a cult or other religious organization that requires no contact to the outside world. To avoid war or persecution during a genocide. To escape famine or natural disaster. Death by floods, flash floods, debris flows, hurricanes and tornadoes. Death in the water, with no body recovered. Runaways: Minors who run away from home, from the institution where they have been placed, or from the people responsible for their care. Abduction by a third person: Abduction of minors by anyone other than the parents or the persons with parental authority. National or international parental abduction: Parental abductions are cases where a child is taken to or kept in a country or place other than that of his/her normal residence by one or more parents or persons with parental authority, against another parent's will or against the will of the person with parental authority. Missing unaccompanied migrant minors: Disappearances of migrant children, nationals of a country in which there is no free movement of persons, under the age of 18 who have been separated from both parents and are not being cared for by an adult, who by law is responsible for doing so.
Lost, injured or otherwise missing children: Disappearances for no apparent reason of minors who got lost or hurt themselves and cannot be found as well as children whose reason for disappearing has not yet been determined. A common misconception is that a person must be absent for at least 24 hours before being classed as missing, but this is the case. Law enforcement agencies stress that the case should be reported as early as possible. In most common law jurisdictions a missing person can be declared dead in absentia after seven years; this time frame may be reduced in certain cases, such as deaths in major battles or mass disasters such as the September 11 attacks. In most countries, the police are the default agency for leading an investigation into a missing person case. Disappearances at sea are a general exception, as these require a specialized agency such as a coast guard. In many countries, such as the United States, voluntary search and rescue teams can be called out to assist the police in the search.
Rescue agencies such as fire departments, mountain rescue and cave rescue may participate in cases that require their specialized resources. Police forces such as Lancashire Constabulary stress the need to try to find the person to assess how vulnerable the person is, to search places that the person may have links to. Various charities exist to assist the investigations into unsolved cases; these include the National Center for Missing & Exploited Children in the US, Missing People in the UK, Child Focus in Belgium, The Smile of the Child in Greece. Some missing person cases are given wide media coverage, with the searchers turning to the public for assistance; the persons' photographs may be displayed on bulletin boards, milk cartons, postcards and social media to publicize their descri
A home page or a start page is the initial or main web page of a website or a browser. The initial page of a website is sometimes called main page as well. A home page is the main page a visitor navigating to a website from a web search engine will see, it may serve as a landing page to attract visitors; the home page is used to facilitate navigation to other pages on the site by providing links to prioritized and recent articles and pages, a search box. For example, a news website may present headlines and first paragraphs of top stories, with links to full articles, in a dynamic web page that reflects the popularity and recentness of stories. Meanwhile, other websites use the home page to attract users to create an account. Once they are logged in, the home page may be redirected to their profile page; this may in turn be referred to as the "personal home page". A website may have multiple home pages. Wikipedia, for example, has a home page at wikipedia.org, as well as language-specific home pages, such as en.wikipedia.org and de.wikipedia.org.
The majority of websites have a home page with underlying content pages, although some websites contain only a single page. The uniform resource locator of a home page is most the base-level domain name, such as https://wikipedia.org. It may be found at http://domain.tld/index.html or http://domain.tld/default.html, where "tld" refers to the top-level domain used by the website. If a home page has not been created for a web site, many web servers will default to display a list of files located in the site's directory, if the security settings of the directory permit; this list will include hyperlinks to the files, allowing for simple file sharing without maintaining a separate HTML file. A home page refers to the first page that appears upon opening a web browser, sometimes called the start page, although the home page of a website can be used as a start page; this start page can be a website, or it can be a page with various browser functions such as the display of thumbnails of visited websites.
Multiple websites can be set as a start page. Some websites are intended to be used as start pages, such as iGoogle, My Yahoo!, MSN.com, provide links to used services such as webmail and online weather forecasts. In the early days of the World Wide Web in the first half of the 1990s, an important part of web pages belonged to students or teachers with a UNIX account in their university. System administrators of such systems installed an HTTP server pointing its root directory to the directory containing the users accounts. On UNIX, the base directory of an account is called "home", the HOME environment variable contains its path; the URL of the home page has the format https://example.edu/~my_username/. Thus the term home page appeared and spread to its current usage. A personal home page has served as a means of self-portrayal, job-related presentation, pure enjoyment, giving way to professional advancement and social interaction. Owing to the rise of social media sites, personal home pages are no longer as common as during the mid-late 1990s and early-2000s.
A personal web page is commonly called a home page, although such websites can contain many pages. These kind of personal portals were popular in the earlier era of the World Wide Web. Examples of such services include: iGoogle, My Excite and My Lycos. In Germany, the term "homepage" is used as a synonym for the term "website". A home page can be used outside the context of web browsers, such as to refer to the principal screen of a user interface referred to as a home screen on mobile devices such as mobile phones. Contact page Landing page Link page Site map Splash screen Web design Media related to Home pages at Wikimedia Commons Internet Corporation For Assigned Names and Numbers World Wide Web Consortium The Internet Society
Child Focus is the common name of the European Center for Missing and Sexually Exploited Children. Their emergency telephone numbers are: 116 000 toll-free, in Belgium connects it to Child Focus, in some other EU-countries this number is routed to a local similar organisation. +32 2 475 44 99 These numbers are available at all times. Child Focus is active in the prevention of the following matters: Missing children Abduction of children by a parent or stranger Runaway children Sexually abused and exploited childrenThe people at Child Focus provide psychological and legal support to the victims of these events, they follow their cases and sometimes ensure they are treated with due care by the persons in charge. They help and spread the information about missing children by publishing their pictures and descriptions in newspapers, etc. Since 1998, Child Focus has treated 3000 cases a year, closed 70% of them within the year. Child Focus' funds come from: The Belgian state Donations from people and organizations Child Focus was created on Jean-Denis Lejeune's initiative in June 1996, one year after the abduction of his daughter Julie and her friend Melissa by Marc Dutroux.
Lejeune had learned about the existence of the National Center for Missing and Exploited Children in Washington, D. C. and went to visit it. During the White March in Brussels on October 20, 1996, he asked Prime Minister Jean-Luc Dehaene for help in creating a similar organization in Belgium, its honorary president is her Majesty Queen Paola. On March 31, 1998, Child Focus was operational, in July 1997, Daniel Cardon de Lichtbuer became the first Chairman of the organization. Jean-Denis Lejeune Marc Dutroux Michel Fourniret Claude Lelièvre Official website