Http Error Code Host Not Found
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Status codes 301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons v t e The 404 or Not Found error message is a Hypertext Transfer Protocol (HTTP) standard response code, in computer network communications, to indicate that the error 404 not found client was able to communicate with a given server, but the server could not find what 404 error page was requested. The web site hosting server will typically generate a "404 Not Found" web page when a user attempts to follow a broken http error 404. the requested resource is not found. or dead link; hence the 404 error is one of the most recognizable errors encountered on the World Wide Web. Contents 1 Overview 2 Custom error pages 2.1 Tracking/Checking 404 errors 3 Phony 404 errors 4 404 substatus error codes defined
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by IIS 4.1 Slang usage 5 See also 6 References 7 External links Overview[edit] When communicating via HTTP, a server is required to respond to a request, such as a web browser request for a web page, with a numeric response code and an optional, mandatory, or disallowed (based upon the status code) message. In the code 404, the first digit indicates a client error, such as a mistyped Uniform Resource Locator (URL). The following two digits indicate the specific error http status 404 how to fix it encountered. HTTP's use of three-digit codes is similar to the use of such codes in earlier protocols such as FTP and NNTP. At the HTTP level, a 404 response code is followed by a human-readable "reason phrase". The HTTP specification suggests the phrase "Not Found"[1] and many web servers by default issue an HTML page that includes both the 404 code and the "Not Found" phrase. A 404 error is often returned when pages have been moved or deleted. In the first case, it is better to employ URL mapping or URL redirection by returning a 301 Moved Permanently response, which can be configured in most server configuration files, or through URL rewriting; in the second case, a 410 Gone should be returned. Because these two options require special server configuration, most websites do not make use of them. 404 errors should not be confused with DNS errors, which appear when the given URL refers to a server name that does not exist. A 404 error indicates that the server itself was found, but that the server was not able to retrieve the requested page. Custom error pages[edit] The Wikimedia 404 message Web servers can typically be configured to display a customised 404 error page, including a more natural description, the parent site's branding, and sometimes a site map, a search form or 404 page widget. The protocol level phrase, which is hidden from the user, is rarely customized. Internet Explor
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HTTP Error Codes Posted Oct 24, 2014 82.5k views FAQ Apache Nginx Introduction When accessing a web server or application, every HTTP request that is received by a server is responded to with https://en.wikipedia.org/wiki/HTTP_404 an HTTP status code. HTTP status codes are three-digit codes, and are grouped into five different classes. The class of a status code can be quickly identified by its first digit: 1xx: Informational 2xx: Success 3xx: Redirection 4xx: Client Error 5xx: Server Error This guide focuses on identifying and troubleshooting the most commonly encountered HTTP error codes, i.e. 4xx and 5xx status codes, from a system administrator's https://www.digitalocean.com/community/tutorials/how-to-troubleshoot-common-http-error-codes perspective. There are many situations that could cause a web server to respond to a request with a particular error code--we will cover common potential causes and solutions. Client and Server Error Overview Client errors, or HTTP status codes from 400 to 499, are the result of HTTP requests sent by a user client (i.e. a web browser or other HTTP client). Even though these types of errors are client-related, it is often useful to know which error code a user is encountering to determine if the potential issue can be fixed by server configuration. Server errors, or HTTP status codes from 500 to 599, are returned by a web server when it is aware that an error has occurred or is otherwise not able to process the request. General Troubleshooting Tips When using a web browser to test a web server, refresh the browser after making server changes Check server logs for more details about how the server is handling the requests. For example, web servers such as Apache or Nginx produce two files called access.log and error.log that can be scanned for relevant information Keep in mind that HTTP status code definitions are part of a
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HTTPS 12. AJAX 3. HTTP Status Codes and Errors An HTTP request can fail because of a network error or because of problems encountered while the request is executing on the web server. 3.1 Network Errors If a network error occurs while transmitting a request message, error information is available from the underlying network component; e.g. Windows Sockets or WinInet. Monitoring tools like HttpWatch can display error codes for situations such as: The host name could not be converted into an IP address, perhaps because an invalid host name was used or because no DNS lookup service is available. The browser could not connect to the web server. This may happen if the web server is not running or is listening on the wrong port. The network connection may be broken while transmitting the request message, perhaps because a physical network connection has been interrupted, e.g. a network cable has been unplugged. 3.2 Status Codes HTTP status codes are returned by web servers to describe if and how a request was processed. The codes are grouped by the first digit: 1xx - Informational Any code starting with '1' is an intermediate response and indicates that the server has received the request but has not finished processing it. For example, IIS initially replies with 100 Continue when it receives a POST request and then with 200 OK once it has been processed (See 6. Methods) 2xx - Successful These codes are used when a request has been successfully processed. For example, the value 200 is used when the requested resource is being returned to the HTTP client in the body of the response message. 3xx - Redirection Codes starting with a '3' indicate that the request was processed, but the browser should get the resource from another location. Some examples are: 302 The requested resource has been temporarily movedand the browser should issue a request to the URL supplied in the Location response header. (See 7. Redirection) 304 The requested resource has not been modified and the browser should read from its local cache instead. The Content-Length header will be zero or absent because content is never returned with a 304 response (See 5. Caching for more detail) 4xx - Client Error The server returns these codes when they is a problem with the client's request. Here are some examples: 401 Anonymous clients are not authorized to view the requested content and must provide authentication information in the WWW-Authenticate request header. (See 10. Authentication for more detail) 404 The requested resource does not exist on the server 5xx - Server Error A