Common HTTP error codes: 100, 200, 300, 400, 500 series
HTTP status codes ranging from 100 to 199 are informational codes. If a browser is attempting to access a website and these codes are returned, they are normally not displayed onscreen. They are simply internal codes for the browser’s reference. 100 Continue The HTTP 100 Continue informational status response code indicates that everything so far is OK and that the client should continue with the request or ignore it if it is already finished. To have a server check the request's headers, a client must send Expect : 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. Status codes ranging from 200 to 299 are success codes. These codes are used internally by the browser as a way of confirming the success and the current status of a request. Although these codes are not normally displayed, there are troubleshooting tools that can read them, an...