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This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
Request–response pattern can be implemented synchronously ( such as web service calls over HTTP) or asynchronously. [ 1 ] In contrast, one-way computer communication, which is like the push-to-talk or "barge in" feature found on some phones and two-way radios , sends a message without waiting for a response.
The recipient is informed that they should reply to this email. RSVP, meaning Reply Requested, please, from the French Répondez s'il vous plaît. The recipient is informed that they should reply to this email. Often used for replies (accept/decline) to invitations. SFW, meaning Safe For Work. Used in corporate emails to indicate that although ...
The consumer initiates with a message to which the provider responds with status. If the response is a status, the exchange is complete, but if the response is a fault, the consumer must respond with a status. In-Out: This is equivalent to request–response. A standard two-way message exchange where the consumer initiates with a message, the ...
It, however, is only defined for the request header. Its meaning in a response header is not specified. [77] The behavior of Pragma: no-cache in a response is implementation specific. While some user agents do pay attention to this field in responses, [78] the HTTP/1.1 RFC specifically warns against relying on this behavior.
The encoded-word format is not used for the names of the headers fields (for example Subject). These names are usually English terms and always in ASCII in the raw message. When viewing a message with a non-English email client, the header field names might be translated by the client.
Each response header field has a defined meaning which can be further refined by the semantics of the request method or response status code. HTTP/1.1 example of request / response transaction Below is a sample HTTP transaction between an HTTP/1.1 client and an HTTP/1.1 server running on www.example.com , port 80.
The client only has to understand the response based on the relevant application protocol, i.e. the content and the formatting of the data for the requested service. Clients and servers exchange messages in a request–response messaging pattern. The client sends a request, and the server returns a response.