added http_accept feature to represent "Accept:" HTTP header
This commit is contained in:
Jocelyn Fiat
@@ -4,85 +4,66 @@ note
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Interface for a request environment
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It includes CGI interface and a few extra values that are usually valuable
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See http://ken.coar.org/cgi/draft-coar-cgi-v11-03.txt
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See http://www.ietf.org/rfc/rfc3875
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2.2. Basic Rules
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The following rules are used throughout this specification to
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describe basic parsing constructs.
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alpha = lowalpha | hialpha
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alphanum = alpha | digit
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lowalpha = a | b | c | d | e | f | g | h
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| i | j | k | l | m | n | o | p
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| q | r | s | t | u | v | w | x
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| y | z
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hialpha = A | B | C | D | E | F | G | H
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| I | J | K | L | M | N | O | P
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| Q | R | S | T | U | V | W | X
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| Y | Z
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digit = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
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| 8 | 9
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hex = digit | A | B | C | D | E | F | a
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| b | c | d | e | f
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escaped = % hex hex
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OCTET = <any 8-bit sequence of data>
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CHAR = <any US-ASCII character (octets 0 - 127)>
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CTL = <any US-ASCII control character
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(octets 0 - 31) and DEL (127)>
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CR = <US-ASCII CR, carriage return (13)>
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LF = <US-ASCII LF, linefeed (10)>
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SP = <US-ASCII SP, space (32)>
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HT = <US-ASCII HT, horizontal tab (9)>
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NL = CR | LF
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LWSP = SP | HT | NL
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tspecial = ( | ) | "@" | , | ; | : | \ | "
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| / | [ | ] | ? | < | > | { | }
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| SP | HT | NL
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token = 1*<any CHAR except CTLs or tspecials>
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quoted-string = ( " *qdtext " ) | ( "<" *qatext ">")
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qdtext = <any CHAR except %" and CTLs but including LWSP>
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qatext = <any CHAR except "<", ">" and CTLs but including LWSP>
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mark = - | _ | . | ! | ~ | * | ' | ( | )
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unreserved = alphanum | mark
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reserved = ; | / | ? | : | @ | & | = | $ | ,
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uric = reserved | unreserved | escaped
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alpha = lowalpha | hialpha
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lowalpha = a | b | c | d | e | f | g | h |
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i | j | k | l | m | n | o | p |
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q | r | s | t | u | v | w | x |
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y | z
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hialpha = A | B | C | D | E | F | G | H |
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I | J | K | L | M | N | O | P |
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Q | R | S | T | U | V | W | X |
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Y | Z
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digit = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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8 | 9
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alphanum = alpha | digit
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OCTET = <any 8-bit byte>
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CHAR = alpha | digit | separator | ! | # | $ |
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%% | & | ' | * | + | - | . | ` |
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^ | _ | { | | | } | ~ | CTL
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CTL = <any control character>
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SP = <space character>
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HT = <horizontal tab character>
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NL = <newline>
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LWSP = SP | HT | NL
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separator = ( | ) | < | > | @ | , | ; | : |
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\ | " | / | [ | ] | ? | = | { |
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} | SP | HT
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token = 1*<any CHAR except CTLs or separators>
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quoted-string = " *qdtext "
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qdtext = <any CHAR except " and CTLs but including LWSP>
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TEXT = <any printable character>
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2.3. URL Encoding
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reserved = ; | / | ? | : | @ | & | = | + | $ |
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, | [ | ]
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hex = digit | A | B | C | D | E | F | a | b
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| c | d | e | f
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escaped = "%%" hex hex
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unreserved = alpha | digit | mark
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mark = - | _ | . | ! | ~ | * | ' | ( | )
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Note that newline (NL) need not be a single character, but can
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be a character sequence.
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3.2. The Script-URI
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The 'Script-URI' is defined as the URI of the resource
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identified by the metavariables. Often, this URI will be the
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same as the URI requested by the client (the 'Client-URI');
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however, it need not be. Instead, it could be a URI invented
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by the server, and so it can only be used in the context of
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the server and its CGI interface.
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script-URI = <scheme> "://" <server-name> ":" <server-port>
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<script-path> <extra-path> "?" <query-string>
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The Script-URI has the syntax of generic-RL as defined in
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section 2.1 of RFC 1808 [7], with the exception that object
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parameters and fragment identifiers are not permitted:
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where <scheme> is found from SERVER_PROTOCOL, <server-name>,
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<server-port> and <query-string> are the values of the respective
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meta-variables. The SCRIPT_NAME and PATH_INFO values, URL-encoded
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with ";", "=" and "?" reserved, give <script-path> and <extra-path>.
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<scheme>://<host><port>/<path>?<query>
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The various components of the Script-URI are defined by some
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of the metavariables (see section 4 below);
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script-uri = protocol "://" SERVER_NAME ":" SERVER_PORT enc-script
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enc-path-info "?" QUERY_STRING
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where 'protocol' is obtained from SERVER_PROTOCOL,
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'enc-script' is a URL-encoded version of SCRIPT_NAME and
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'enc-path-info' is a URL-encoded version of PATH_INFO. See
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section 4.6 for more information about the PATH_INFO
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metavariable.
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Note that the scheme and the protocol are not identical; for
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instance, a resource accessed via an SSL mechanism may have a
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Client-URI with a scheme of "https" rather than "http".
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CGI/1.1 provides no means for the script to reconstruct this,
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and therefore the Script-URI includes the base protocol used.
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]"
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legal: "See notice at end of class."
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status: "See notice at end of class."
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@@ -518,6 +499,12 @@ feature -- Common Gateway Interface - 1.1 8 January 1996
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feature -- HTTP_*
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http_accept: detachable STRING
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-- Contents of the Accept: header from the current request, if there is one.
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-- Example: 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
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deferred
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end
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http_accept_charset: detachable STRING
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-- Contents of the Accept-Charset: header from the current request, if there is one.
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-- Example: 'iso-8859-1,*,utf-8'.
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