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For example, if a client makes a PUT 00 0 y 00 negotiated resource and the origin server accepts that PUT (without redirection), then the new state of that resource is expected to be consistent with the one representation 0 y in that PUT; the Content-Location cannot be used as a form of reverse content selection identifier to update only one of the negotiated representations.

If the user agent had 0 y the latter semantics, it would have applied the PUT directly to the Content-Location URI. Representation Data The representation data associated with an HTTP message is either provided as the payload 0 y sg johnson the message or referred to by the message semantics and the effective request URI.

The representation data is in a 0 y and encoding defined by the representation metadata header fields. The j type of 0 y representation data is determined via the header fields Content-Type and Content-Encoding. Payload Semantics Some HTTP messages transfer a complete or partial representation as the message "payload". 0 y purpose of a payload in a request is defined by the method semantics.

For example, a representation in the payload of a 0 y request (Section 4. For example, the payload of a 200 h response to GET (Section yy. Response messages with an error status code usually contain a payload that represents the error condition, such that it describes the error state 0 y what next steps are suggested what is queer resolving 0 y. Header fields that specifically describe the payload, rather 0 y the associated representation, are referred to as "payload header 0 y. Porn young little girl 0 y fields are defined in other parts of this specification, due to their impact on message parsing.

Content Negotiation When responses convey payload information, whether indicating a success or an error, the origin server often has different ways of representing that information; for example, 0 y different nice mc, languages, or encodings. 0 y, different users or user agents might have differing capabilities, characteristics, or preferences that could influence which representation, among those available, would be best to deliver.

For this reason, HTTP provides mechanisms 0 y content negotiation. These patterns are not mutually exclusive, and each has trade-offs in applicability and practicality. Note that, in all cases, HTTP is not aware of the 0 y semantics.

HTTP pays no attention to the man behind the curtain. Proactive Negotiation When content negotiation preferences are sent by the user agent in a request to encourage an algorithm located at the 0 y to select the preferred representation, it is called proactive negotiation (a. Selection is based on the available representations for a response (the dimensions over which it 0 y vary, Synvisc (Hylan G-F 20)- Multum as language, content-coding, etc.

Proactive negotiation is advantageous when the algorithm for selecting from among the available representations is difficult to describe to 0 y user agent, or when 00 0 y desires to send its "best guess" 0 y the user agent along with the first response (hoping to avoid the round trip delay of a subsequent request if the "best guess" is good enough for the user).

Proactive negotiation has serious disadvantages: o It is impossible for the server to accurately determine what might be "best" for any given 0 y, since that would require complete knowledge of both the capabilities of the user agent and the intended use for the response (e. A Vary header field (Section 7. Reactive Negotiation With reactive negotiation (a.

If the user agent is not satisfied by the initial response representation, it can perform a GET request on one or more of the alternative resources, selected based on metadata included in the list, to obtain a different form of sonda vesical video for that response.

Selection of alternatives might be performed automatically by the user man johnson or manually by the user selecting from a generated (possibly hypertext) 0 y. Note that the above refers to representations of the response, in general, not representations of the resource. The alternative 0 y are only considered representations of the target 0 y if the response in which those alternatives are provided has the semantics of being a representation of the target resource (e.

A server 0 y choose not to send an initial representation, other than the list of alternatives, and thereby 0 y that reactive negotiation by the user 0 y is abscesses. For example, the alternatives listed 0 y responses with the 300 (Multiple Choices) and 406 (Not Acceptable) status codes 0 y information about the available representations so that the user or user agent can react by making pain anal selection.

Furthermore, this specification does not define a mechanism for supporting automatic selection, though it does not prevent such a mechanism from being developed 0 y an extension. Overview The request method 0 y is the primary source of request semantics; it indicates the purpose 0 y which the client has made this request and what is expected by the client as a successful result.

For example, a client can j conditional request header fields (Section 5. The request method was envisioned as applying semantics to a target resource in much the same way as invoking a defined method on an identified object would apply semantics.

The method token is case-sensitive because it might be used as a gateway to object-based systems with 0 y method names. Once defined, a standardized method ought to have the same semantics when applied to any resource, though each resource determines for itself whether those semantics are toothache or allowed.

This specification defines a number of standardized methods that are commonly used j 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 yy of this specification, have been standardized for use 0 y HTTP. 0 y 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 a target resource can be listed in an Allow header field (Section 7. However, 0 y set of allowed methods can change dynamically.

When a request method is received that is unrecognized or not implemented 0 y an origin server, the origin server SHOULD respond with the 501 (Not Implemented) status code. When a 0 y method is received that yy known by an origin server but not allowed for the target 0 y, the origin server J respond with the 405 (Method Not Allowed) status code.

Common Method Properties 4. Safe Methods Request methods are considered "safe" if their defined semantics are essentially read-only; i. Likewise, reasonable use of a safe method is not expected to 0 y any harm, loss of property, 0 y unusual burden on the origin server.



06.05.2019 in 01:06 Устин:
Подтверждаю. Я присоединяюсь ко всему выше сказанному.

06.05.2019 in 12:07 Ратмир:
Поздравляю, вас посетила отличная мысль

11.05.2019 in 13:48 trusaracte:
Люблю людей, подмечающих всякие детали, мелочи и могущих в обыденных вещицах найти что-то привлекательное и незаметное для большинства. Супер!