Headers in server response

This service allows you to view the server response headers and find out the status code HTTP. This is the information that the server sends a response to the HTTP request.
Headers (headers) contain information about the result of the query browser, the technologies used on the server, the amount of content data cookies. Also often in the server response headers are sent instructions behavior for the client (browser).

By Title quite possible to see exactly what the web server (Apache, nginx, etc.) And the operating system used on the server. You can also see the time at which the server lives.

The most important in the server response can be regarded as a status code.

Status codes

Status Code - is a three-digit number that is contained in the first line of the server response. Code informs the client about the success of the request or the errors that occurred.

Status codes are divided into 5 groups:

  • 1xx - Informational. They describe the process of transmission.
  • 2xx - Successful. They talk about the successful transfer.
  • 3xx - Redirection codes. They signal a request redirection (redirect).
  • 4xx - Client error. Errors in the query syntax, host access, etc.
  • 5xx - Server Error. Errors in the execution of the query associated with the server.

You may have encountered something out of this:

  • 200 OK means that everything is in order, the request is processed and answered. The most popular server response
  • 301 Moved Permanently means that the required document is moved to a different URI. The new address is specified in the header Location.
  • 302 Found (in HTTP v1.1), Moved Temporarily (in HTTP 1.0) indicates that the required document is temporarily transferred to another URI, which is in the header Location.
  • 400 Bad Request indicates that the query syntax error.
  • 401 Unauthorized means that the need for access authentication.
  • 403 Forbidden - do not have enough permissions to execute the query.
  • 404 Not Found - the server can not find the requested URI.
  • 500 Internal Server Error - any other server error if it does not fit the rest of the response codes.