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In HTTP version 1.x, header fields are transmitted after the request line (in case of a request HTTP message) or the response line (in case of a response HTTP message), which is the first line of a message. Header fields are colon-separated key-value pairs in clear-text string format, terminated by a carriage return (CR) and line feed (LF ...
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The plain text version may be missing important formatting information, however. (For example, a mathematical equation may lose a superscript and take on an entirely new meaning.) Many [citation needed] mailing lists deliberately block HTML email, either stripping out the HTML part to just leave the plain text part or rejecting the entire message.
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.
Clicking on the hyperlink automatically opens the default email client, with the destination email address pre-filled. It is possible to specify initial values for headers (e.g. subject, cc, etc.) and message body in the URL. Blanks, carriage returns, and linefeeds cannot be directly embedded but must be percent-encoded: [4]
The request/response message consists of the following: Request line, such as GET /logo.gif HTTP/1.1 or Status line, such as HTTP/1.1 200 OK, Headers; An empty line; Optional HTTP message body data; The request/status line and headers must all end with <CR><LF> (that is, a carriage return followed by a line feed).
In this example the email message is sent to two mailboxes on the same SMTP server: one for each recipient listed in the To: and Cc: header fields. The corresponding SMTP command is RCPT TO . Each successful reception and execution of a command is acknowledged by the server with a result code and response message (e.g., 250 Ok ).
Customize your email inbox with easier ways to sort and view and a cool design that feels like you. (Photo: Getty) (Westend61 via Getty Images) Take a look at your cell phone screen.