Connection Errors
Invalid URL
Invalid URL means that the URL was misspelled. Some examples of correctly formatted URLs: http://www.someurl.com http://www.someurl.com/ http://www.someurl.com/page.jsp http://www.someurl.com/page.jsp?QueryString
Host Not Found
This error message appears when the web server host computer was not found based on the host/domain name. This usually indicates a problem with the DNS system, the connection with your DNS system or general Internet connectivity problems.
Time Out
This error message appears when a web server host computer was found based on the host/domain name, but no link could be established within the predefined time limit. The Time Out default value is 90 sec. This usually indicates a problem with your routers and/or firewall, a hardware problem with the web server or general Internet connectivity problems.
Connection Refused
This error message appears when the host was found, but connection on the default gateway was refused. This usually indicates software problems on the web server.
No Response from Web Server
This error message appears when the host was found, a link was established with the web server, but the web server does not respond within a predefined time limit. This can indicate a software problem on the web server or other back-end machines, possibly due to web server overload.
Unexpected Error
The ‘Unexpected Error’ message appears when our control system detects an error that does not fall under any of the above categories. This error message is rarely used.
Web Server Status Codes/Messages
The status code is a 3-digit code, generated as a result of request interpretation. These codes are described below. The status message provides a short explanation for the status code. 1xx : Informative – request received, process in progress 2xx : Success – the action was successfully received, interpreted and accepted. 3xx : Redirection – additional actions must be taken to complete the request. 4xx : Client error – the request was badly formulated or cannot be executed. 5xx : Server error – the server was unable to execute a seemingly valid request.
- 1xx : Informative – request received, process in progress
- 2xx : Success – the action was successfully received, interpreted and accepted.
- 3xx : Redirection – additional actions must be taken to complete the request.
- 4xx : Client error – the request was badly formulated or cannot be executed
- 5xx : Server error – the server was unable to execute a seemingly valid request..
300 Multiple Choices
The requested page is available in different formats. The different formats are listed with the corresponding addresses, so that the visitor can choose the appropriate format.
301 Moved permanently
The requested page is no longer available at this location and was moved to another location.
302 Moved temporarily
The requested page is temporarily unavailable at this location and was moved to another location.
303 See Other
The requested page is available at another location.
304 Not Modified
This error message will not appear when you are a visitor. When a page is requested again to check whether the content was modified, this message will indicate that the content was not modified.
305 Use Proxy
The page can only be requested via a proxy server. A proxy server enables faster searches. The proxy server saves the most frequently requested information during a certain period and, if a web page is requested, will first check whether the requested web page has been requested before. If this is the case, the web page is still locally on the server and will be displayed on your computer in a flash.
400 Bad request
De bezoeker heeft een onbekend commando doorgegeven aan de server, bijvoorbeeld een fout gespeld adres.
401 Unauthorized
The visitor of the page is not authorized to visit this location. A log-in and password are most likely required.
402 Payment Required
To visit the requested page, a payment is required and the visitor did not confirm he was prepared to pay.
403 Forbidden
The visitor of the page is not authorized to visit the requested location.
404 Not found
The requested page does not exist or exists no longer.
405 Method Not Allowed
The visitor passed an unauthorized command to the server.
406 Not Acceptable (encoding)
The web server is unable to deliver the requested information in a format understandable to your browser.
407 Proxy Authentication Required
The visitor first has to sign on to the proxy server before the requested page can be viewed. Usually a window appears in which the visitor has to fill in his name and password. This message will appear in case of log-on failure.
408 Request Timed Out
The request could not be handled within the predefined time limit. The server may be overloaded. The visitor can try again later.
409 Conflicting Request
A problem occurred during retrieval of the requested page. It is possible that the content of the page is being modified, so that the server cannot access the requested location.
410 Gone
The requested location is not available and no other address is known.
411 Content Length Required
Your browser did not provide the server with the required information on the length of your request. You might be able to open the requested page with another browser or a more recent version.
412 Precondition Failed
During retrieval of the page, additional information was supplied to find the right page. However, the server was unable to find the requested page.
413 Request Entity Too Long
The server refuses to display the requested page because it is too large, for example more than 5MB.
414 Request URI Too Long
The entered Internet address is too long. There may be an error in the address you entered. The maximum address length is 1024 characters.
415 Unsupported Media Type
The server is unable to show the requested page.
500 Internal Server Error
There is a problem with the server.
501 Not Implemented
The server does not support the functionality required for executing your request.
502 Bad Gateway
The visitor can receive this error message from a server serving as proxy server or gateway, in case it received an error message or invalid response from the machine actually containing the requested page.
503 Service Unavailable
The server containing the requested page is temporarily unavailable. Possible causes are overload or maintenance. The visitor can try again later.
504 Gateway Timeout
The visitor can receive this error message from a server serving as proxy server or gateway, in case it did not receive the requested page within the predefined time limit from the server actually containing the requested page.
505 HTTP Version Not Supported
The browser tried to communicate with the server in an http protocol version not (yet) supported by the server.
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