1m_redirects

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1m_redirects

Web Server | Web log

HTTP response status codes indicate whether a specific HTTP request has been successfully completed or not.

The 3XX class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request. The action required may be carried out by the user agent without interaction with the user if and only if the method used in the second request is GET or HEAD. A client SHOULD detect infinite redirection loops, since such loops generate network traffic for each redirection. 1

The Netdata Agent calculates the ratio of redirection HTTP requests over the last minute. This metric does not include the “304 Not modified” message.

Redirection messages (3XX)

The redirect messages below contain the descriptions as provided by
Mozilla. 2

  • 300 Multiple Choice: The request has more than one possible response. The user agent or user
    should choose one of them. (There is no standardized way of choosing one of the responses, but
    HTML links to the possibilities are recommended so the user can pick.)

  • 301 Moved Permanently: The URL of the requested resource has been changed permanently. The new
    URL is given in the response.

  • 302 Found: This response code means that the URI of requested resource has been changed
    temporarily. Further changes in the URI might be made in the future. Therefore, this same URI
    should be used by the client in future requests.

  • 303 See Other: The server sent this response to direct the client to get the requested resource
    at another URI with a GET request.

  • 304 Not Modified: This is used for caching purposes. It tells the client that the response has
    not been modified, so the client can continue to use the same cached version of the response.

  • 305 Use Proxy: Defined in a previous version of the HTTP specification to indicate that a
    requested response must be accessed by a proxy. It has been deprecated due to security concerns
    regarding in-band configuration of a proxy.

  • 306 unused: This response code is no longer used; it is just reserved. It was used in a previous
    version of the HTTP/1.1 specification.

  • 307 Temporary Redirect: The server sends this response to direct the client to get the requested
    resource at another URI with same method that was used in the prior request. This has the same
    semantics as the 302 Found HTTP response code, with the exception that the user agent must not
    change the HTTP method used: if a POST was used in the first request, a POST must be used in the
    second request.

  • 308 Permanent Redirect: This means that the resource is now permanently located at another URI,
    specified by the Location: HTTP Response header. This has the same semantics as the 301 Moved
    Permanently HTTP response code, with the exception that the user agent must not change the HTTP
    method used: if a POST was used in the first request, a POST must be used in the second request.

References and sources

  1. 3XX codes in the HTTP protocol

  2. HTTP redirection messages on Mozilla

Troubleshooting section:

General approach

You can identify exactly what HTTP response code your web server send back to your clients by opening the Netdata dashboard and inspecting the detailed_response_codes chart for your web server. This chart keeps track of exactly what error codes your web server sends out.

You should also check the server error logs. For example, web servers such as Apache or Nginx produce and error logs, by default under /var/log/{nginx, apache2}/{access.log, error.log}