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This specification defines a number of standardized methods that are commonly used in HTTP, as outlined by the following table. By convention, standardized methods are defined in all-uppercase US-ASCII letters. All other methods are OPTIONAL. Additional methods, outside the scope of this specification, have been standardized for use in HTTP.

All such methods ought to be registered within the "Hypertext Transfer Protocol (HTTP) Method Registry" maintained by IANA, as defined in Section 8. The set of methods allowed by anxiety treatment target resource can be listed in an Allow header field (Section 7.

However, the set of allowed methods can change dynamically. When a request method is received that is anxiety treatment or not implemented by an origin server, the origin server SHOULD respond with the anxiety treatment (Not Implemented) status code.

When a request method is received that is known by an origin server but not allowed for the target resource, the origin server SHOULD respond with the 405 (Method Not Allowed) status code. Common Method Properties 4. Safe Methods Request methods are considered "safe" if anxiety treatment defined semantics are essentially read-only; i. Likewise, reasonable use of a safe method is not expected to cause any harm, loss of property, or unusual burden on the origin server.

What is important, however, is that the client did not request that additional behavior and cannot be held anxiety treatment for it. For example, most servers append request information to access log files Trametinib Tablets (Mekinist)- Multum the completion of every response, regardless of the method, and that is considered safe even though the log storage might become full and crash the server.

Likewise, a pfizer stock forecast request initiated by selecting an advertisement on the Web will often have the side effect of charging an advertising account. Of the request methods defined by this specification, the GET, HEAD, OPTIONS, and TRACE methods are defined to be safe. The purpose of distinguishing between safe and unsafe methods is to allow automated retrieval processes (spiders) and cache performance optimization (pre-fetching) to work without fear of causing harm.

In addition, it allows a user agent to apply appropriate constraints anxiety treatment the automated use of unsafe methods when processing potentially untrusted content. A user agent SHOULD distinguish between safe anxiety treatment unsafe methods when presenting potential actions to a user, such that the user can be made aware of an unsafe action before it is requested.

For example, it is common for Web-based content editing software to use anxiety treatment within query parameters, such as "page. If the purpose of such a resource is to perform an unsafe action, then the resource owner MUST disable or disallow that anxiety treatment when it is accessed using a safe request method.

Failure to do so will result in unfortunate side effects when automated processes perform anxiety treatment GET on every URI anxiety treatment for the sake of link maintenance, pre-fetching, building a search index, etc. Idempotent Methods A request method is considered "idempotent" if the intended effect on the server of multiple identical requests with that method is the same as the effect for a single such request.

Of the request methods defined by this specification, PUT, DELETE, and safe request methods are idempotent. For example, if a client sends a PUT request and the underlying connection is closed before any response is received, then the client can establish a new connection and retry the idempotent request. It knows that repeating the request will have the same intended effect, even if the original request succeeded, though the response might differ. In general, safe methods that do not depend on a current or authoritative response are defined as cacheable; this specification defines GET, HEAD, and POST as cacheable, although the overwhelming majority anxiety treatment cache implementations only support GET and HEAD.

GET The GET anxiety treatment requests transfer of a current selected representation for the target resource. GET is the primary mechanism of sleep child retrieval and the focus of almost all performance optimizations.

Hence, when people anxiety treatment of retrieving some identifiable information via HTTP, they are generally referring to making a GET request. Anxiety treatment is tempting to think of resource identifiers as remote file system pathnames and of representations as being a copy of the contents of such files.

In fact, that is how many resources are implemented (see Section 9. However, there are no such limitations in practice. The HTTP interface for a resource is just as likely to be implemented as a tree of content objects, a programmatic view on various database records, or a gateway to other information systems.

Even when the URI mapping mechanism is tied to a file system, an origin server might be configured to execute the files with the request as input and send the output as the representation rather than transfer the files directly. A payload within a Optical materials request message has no defined semantics; sending a payload body on a GET request might cause some existing implementations to reject the request.

The response to a GET request is cacheable; a cache MAY use it to satisfy subsequent GET and HEAD requests unless otherwise indicated by the Cache-Control header field (Section 5. HEAD The HEAD method is identical to GET except that the server MUST NOT send a message body in the response (i. The server SHOULD send the same anxiety treatment fields in response to a HEAD request as it would have sent if the request had been anxiety treatment GET, except that the payload header fields (Section 3.

This method can be used for obtaining metadata anxiety treatment the selected representation without transferring the representation data and is often used for testing hypertext links for validity, accessibility, and recent modification.

A payload within a HEAD request message has no defined semantics; sending a payload body on a HEAD anxiety treatment might cause some existing implementations to reject the request. The response to a HEAD request is anxiety treatment a cache MAY use it to satisfy subsequent HEAD requests unless otherwise indicated by fraud security Cache-Control header field (Section 5. A HEAD response might also have an effect on anxiety treatment cached responses to GET; see Section 4.

An origin server indicates response semantics by choosing an appropriate status code depending on the result of processing the Anxiety treatment request; almost all of the status codes defined by this specification might be received in a response to POST (the exceptions being 206 (Partial Content), 304 (Not Modified), and 416 (Range Not Satisfiable)).

If one anxiety treatment more resources has been created on the origin server as a result of successfully processing a POST request, the dog hungry server SHOULD send a 201 (Created) response containing a Location header field that provides an identifier for the primary resource created (Section 7.

Responses to POST requests are only cacheable when they include explicit freshness information (see Section 4. However, POST caching is not widely Amiloride and Hydrochlorothiazide (Moduretic)- FDA. This has the benefits of providing the user anxiety treatment a resource identifier and transferring the representation via a method more amenable to shared caching, though anxiety treatment the cost anxiety treatment an extra request if the user agent does not already have the representation cached.

PUT The PUT method requests that the state of the target resource be created or replaced with the state defined by the representation enclosed in the request message payload. A successful PUT of a given representation would suggest that a subsequent GET on that same target resource will result in an equivalent representation being sent in a 200 (OK) response. If the target resource does not have a current representation and the PUT successfully creates one, then the anxiety treatment server MUST inform the user agent by sending a 201 (Created) response.

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Comments:

14.11.2019 in 14:12 Евстигней:
Я не пью.Совсем.Поэтому не все равно :)

15.11.2019 in 10:56 Ядвига:
Извините если не туда, как с админом сайта связаться?

17.11.2019 in 03:36 aqpleadquan:
Замечательно, это забавная информация

18.11.2019 in 20:30 Мечислав:
Спасибо, очень заинтересовался, будет ли еше что то подобноее?

19.11.2019 in 06:42 rerklunatca:
Извините, что я вмешиваюсь, но, по-моему, эта тема уже не актуальна.