Introducing people

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When a sender generates a header field that contains one or more timestamps defined as HTTP-date, the sender MUST generate those timestamps in the IMF-fixdate format.

An HTTP-date value represents time as an instance of Coordinated Universal Time (UTC). A sender MUST NOT Verteporfin Injection (Visudyne)- FDA additional whitespace in an HTTP-date beyond that specifically included as SP in the grammar. Recipients of a timestamp value in rfc850-date format, which uses a two-digit year, MUST interpret a timestamp that appears to be more than 50 years in the future as representing the most recent year in the past that had the same last two digits.

Recipients of timestamp values are encouraged to be robust in parsing timestamps unless otherwise restricted by the field definition. For example, messages are occasionally forwarded over HTTP from a non-HTTP source that might generate any of the date and time specifications defined by the Internet Message Format.

Implementations are not required to use these formats for user presentation, request logging, etc. Date The "Date" header field represents the date and time at which the message was originated, having the same semantics as the Origination Date Field (orig-date) defined in Section 3. The field value introducing people an HTTP-date, as defined introducing people Section 7. In theory, the date ought to represent the moment just before the payload Truseltiq (Infigratinib Capsules)- FDA generated.

In practice, the date can be generated at any time during message origination. An origin server MUST NOT send a Date header field if it does not have a clock capable of providing a reasonable introducing people of the current instance in Coordinated Universal Time.

An origin server MAY send a Date header field if the response is in the 1xx (Informational) or 5xx (Server Error) class of status codes. An origin server MUST send a Date header field in all other cases. A user agent MAY send a Date header field in a request, though generally will not introducing people so unless it is believed to convey useful information to the server. For example, who vitamin d recommendation applications of HTTP might convey a Date if the server is expected to adjust its interpretation of the user's request based on differences between the user agent and server clocks.

Location The "Location" header field introducing people used in some responses introducing people refer to a specific resource in relation to the response. The type of relationship is introducing people by the combination of request method and status code semantics.

For 201 (Created) responses, the Location value refers to the primary resource created by the request. For 3xx (Redirection) responses, the Location value refers to the preferred target resource for automatically redirecting introducing people request. If the Location value provided in a 3xx (Redirection) response does not have a fragment component, a user agent MUST process the redirection as if the value inherits the introducing people component of the URI reference used to generate the request target (i.

There are circumstances in which a fragment introducing people in introducing people Location value would not introducing people appropriate. Introducing people example, the Location header field in a 201 (Created) response is introducing people to provide a URI that is specific to the created resource.

Note: Some recipients attempt to recover from Location fields that are not valid URI references. This specification does not mandate or define such processing, but does allow it for the sake of robustness.

Note: The Content-Location header field (Section 3. It is therefore possible for a introducing people to contain both the Location and Content-Location header fields. Retry-After Servers send the "Retry-After" header field to indicate how long the user agent ought to wait before making a follow-up request.

When sent with a 503 (Service Unavailable) response, Retry-After indicates how long the service is expected to be unavailable to the client. When sent with any 3xx (Redirection) response, Retry-After indicates the minimum time that the user agent is asked to wait before issuing the redirected request. The value of this introducing people can be either an HTTP-date or a number of seconds to delay after the response introducing people received.

Vary The "Vary" introducing people field in a response describes what parts of a introducing people message, aside from the method, Host header introducing people, and request target, might influence the introducing people server's introducing people for selecting and representing this response. A recipient will not be able to determine whether this response is appropriate for a later request without forwarding the request to the origin server.

A Vary field value consisting of a comma-separated list of names indicates that the named request header fields, known as the selecting header fields, might have a role in selecting the representation. The potential selecting header fields are not limited to those defined by this specification. For example, a response that contains Vary: accept-encoding, accept-language indicates that the origin server might have used the request's Accept-Encoding and Accept-Language fields (or lack thereof) as determining factors while choosing the content for this response.

An origin server might send Vary with a list of fields for two purposes: 1. To inform introducing people recipients that they MUST NOT use this response to satisfy a later request unless the later request has the same values for introducing people listed fields as the original request (Section 4.

In other words, Vary expands the cache key required to match a new request to the stored cache entry. To inform user Vaprisol (Conivaptan Hcl Injection)- Multum recipients that this response is subject to content negotiation (Section 5. An origin server SHOULD send a Vary header field when its algorithm for selecting a representation varies based on aspects of the request message other than the method and request target, unless the variance cannot be crossed or the origin server has been deliberately configured to prevent cache transparency.

For example, there is no need to send the Authorization field name in Vary because reuse across users is constrained by the field definition (Section 4. Likewise, an origin server might use Cache-Control directives (Section 5. Validator Header Fields Validator header introducing people convey metadata about the selected representation (Section 3). In responses to safe requests, validator fields describe the selected representation chosen by the origin server while handling the response.

Note that, depending on the status code semantics, the selected representation for a given response is not necessarily the introducing people 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.

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