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Note that, depending on the status code semantics, the selected representation for a given response is not necessarily the same as the representation enclosed as response payload. In a successful response to a state-changing request, validator fields describe the new representation that has replaced the prior selected representation as a result of processing the request.

Authentication Challenges Authentication challenges indicate what mechanisms are available for the client to provide authentication credentials in future requests. Response Context The remaining response header fields provide more information about the target resource for potential use in later requests.

Allow The "Allow" header field lists the set of methods advertised as supported by the target resource. The purpose Carteolol (Carteolol Hydrochloride)- FDA this field is strictly to inform the recipient of valid request methods associated with the resource.

An origin server MUST generate an Allow field in a 405 (Method Not Allowed) response and MAY do so in any other response. An empty Allow field value indicates that the resource allows no methods, which might occur in a 405 response if the resource has been temporarily disabled by configuration. A proxy MUST NOT modify the Allow header field -- it does not need to understand all of the indicated methods in order to handle them according to the generic message handling rules.

Server The "Server" header field contains information about the software used by the Carteolol (Carteolol Hydrochloride)- FDA server to handle the request, which is often used by clients to help identify the scope of reported interoperability problems, to work around or tailor requests to avoid particular server limitations, and for analytics regarding server or operating system use.

An origin server MAY generate a Server field in its responses. By convention, the product identifiers are listed in decreasing order of their significance for нажмите чтобы прочитать больше the origin server software.

Each product identifier consists of a name and optional version, as defined in Section 5. Overly long and detailed Server field values increase response latency and potentially reveal internal implementation details that might make it (slightly) easier for attackers to find and exploit known security holes. Method Registry The "Hypertext Transfer Protocol (HTTP) Method Registry" defines the namespace for the request method token (Section 4). Procedure HTTP method registrations MUST Carteolol (Carteolol Hydrochloride)- FDA the following fields: o Method Name (see Section 4) o Safe ("yes" or "no", see Section 4.

As such, it is preferred that new methods be registered in a document that isn't specific основываясь на этих данных a single application or data format, since orthogonal technologies deserve orthogonal specification. Since message parsing (Section 3. Definitions of new methods can specify that only a zero-length message body is allowed by requiring a Content-Length header field with a value of "0".

A new method definition needs to indicate whether it is safe (Section 4. If the new method is cacheable, its definition ought to посетить страницу источник how, and under what conditions, a cache can store a response and use it to satisfy a subsequent request. The new method ought to describe whether it can be made conditional (Section 5. Status Code Registry The "Hypertext Transfer Protocol (HTTP) Status Code Registry" defines the namespace for the response status-code token (Section 6).

This section replaces the registration procedure for HTTP Status Codes previously defined in Section 7. Considerations for New Status Codes When it is necessary to express semantics for a response that Carteolol (Carteolol Hydrochloride)- FDA not defined by current status codes, a new status code can be registered. As such, it is preferred that new Carteolol (Carteolol Hydrochloride)- FDA codes be registered in a document that isn't specific to a single application. New status codes are required to fall under one of the categories defined Carteolol (Carteolol Hydrochloride)- FDA Section 6.

To allow existing parsers to process the response message, new status codes cannot disallow a payload, although they can mandate a zero-length payload body. The definition of a new status code ought to explain the request conditions that would cause a response containing that status code (e. The definition of a new status code ought to specify whether or not it is cacheable. Likewise, the definition of a status code can place constraints upon cache behavior.

Finally, the definition of a new status code ought по этому сообщению indicate whether the payload has any implied association with an identified resource (Section 3.

Considerations for New Header Fields Header fields are key:value pairs that can Carteolol (Carteolol Hydrochloride)- FDA used to communicate data about the message, its payload, the target resource, or the connection (i. Authors of specifications defining new fields are advised to keep the name as short as practical and not to prefix the name with "X-" unless the header field will never be Carteolol (Carteolol Hydrochloride)- FDA on the Internet.

Leading and trailing whitespace in raw field values is removed upon field parsing (Section 3. Field definitions where leading or trailing whitespace in увидеть больше is significant will have to use a container syntax such as quoted-string (Section 3.

Because commas (",") Carteolol (Carteolol Hydrochloride)- FDA used as a generic источник статьи between field-values, they need to be treated with care if they are allowed in the field-value. Typically, components that might contain a comma are protected with double-quotes using the quoted-string ABNF production. Allowing both unquoted (token) and quoted (quoted-string) syntax for the parameter value enables recipients to use existing parser components.



10.03.2020 in 09:09 Федосий:
Согласен, полезная мысль

12.03.2020 in 03:24 Куприян:
Шикарно, возьму в дневник

13.03.2020 in 16:57 Викторина:
Всех порву кто против нас!

17.03.2020 in 02:57 Елизавета:
Жаль, что сейчас не могу высказаться - очень занят. Но вернусь - обязательно напишу что я думаю по этому вопросу.