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The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large. [24] 451 Unavailable For Legal Reasons (RFC 7725) A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource. [25]
IP restrictions: The server may also restrict access to specific IP addresses or IP ranges. If the user's IP address is not included in the list of permitted addresses, a 403 status code is returned. Server configuration: The server's configuration can be set to prohibit access to certain files, directories, or areas of the website.
The first was a five-minute outage of every Google service in August 2013. The second was a 25-minute outage of Gmail, Google+, Google Calendar, and Google Docs in January 2014. The third was a YouTube outage in October 2018. The fourth was a Gmail/Google Drive outage in August 2020. The fifth, in November 2020, affected mainly YouTube, and the ...
If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.
Retry-After: If an entity is temporarily unavailable, this instructs the client to try again later. Value could be a specified period of time (in seconds) or a HTTP-date. [56] Example 1: Retry-After: 120; Example 2: Retry-After: Fri, 07 Nov 2014 23:59:59 GMT; Permanent RFC 9110: Server: A name for the server: Server: Apache/2.4.1 (Unix ...
A server capable of replying with an Enhanced Status Code MUST preface (prepend) the Text Part of SMTP Server responses with the Enhanced Status Code followed by one or more spaces. For example, the "221 Bye" reply (after QUIT command) MUST be sent as "221 2.0.0 Bye" instead. [1]
Server overload: If a proxy server or gateway is overwhelmed with a large number of requests and is unable to process all of them in a timely manner, it can result in ...
Caching Behavior: Many web browsers cache 301 redirects.This means that once a user's browser encounters a 301 redirect, subsequent requests to the original URL will be automatically directed to the new URL without contacting the server.