;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; ; RFC 5234 - ABNF CORE RULES ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; OCTET= %x00-FF ; 8 bits of data CHAR= %x01-7F ; any 7-bit US-ASCII character, excluding NUL VCHAR= %x21-7E ; visible (printing) characters ALPHA= %x41-5A / %x61-7A ; A-Z / a-z DIGIT= %x30-39 ; 0-9 CTL= %x00-1F / %x7F ; any US-ASCII control character: ; (octets 0 - 31) and DEL (127) HTAB= %x09 ; horizontal tab LF= %x0A ; linefeed CR= %x0D ; carriage return SP= %x20 ; space DQUOTE= %x22 ; " (Double Quote) BIT= "0" / "1" HEXDIG= DIGIT / "A" / "B" / "C" / "D" / "E" / "F" CRLF= CR LF ; Internet standard newline WSP= SP / HTAB ; white space LWSP= *(WSP / CRLF WSP) ; linear white space (past newline) ;--------------------------------------------------------------------------------------------------------- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; ; RFC 2396 - URI ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;; 1.6. Syntax Notation and Common Elements ;alpha = lowalpha / upalpha lowalpha = "a" / "b" / "c" / "d" / "e" / "f" / "g" / "h" / "i" / "j" / "k" / "l" / "m" / "n" / "o" / "p" / "q" / "r" / "s" / "t" / "u" / "v" / "w" / "x" / "y" / "z" upalpha = "A" / "B" / "C" / "D" / "E" / "F" / "G" / "H" / "I" / "J" / "K" / "L" / "M" / "N" / "O" / "P" / "Q" / "R" / "S" / "T" / "U" / "V" / "W" / "X" / "Y" / "Z" ;digit = "0" / "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9" alphanum = alpha / digit ;;;; 2. URI Characters and Escape Sequences urlc = reserved / unreserved / escaped ;;;; 2.2. Reserved Characters reserved = ";" / "/" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / "," ;;;; 2.3. Unreserved Characters unreserved = alphanum / mark mark = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")" ;;;; 2.4.1. Escaped Encoding escaped = "%" hex hex hex = digit / "A" / "B" / "C" / "D" / "E" / "F" / "a" / "b" / "c" / "d" / "e" / "f" ;;;; 2.4.3. Excluded US-ASCII Characters control = %x00-1F / %x7F ; space = %x20 ; delims = "<" / ">" / "#" / "%" / DQUOTE unwise = "{" / "}" / "/" / "\" / "^" / "[" / "]" / "`" ;;;; 3. URI Syntactic Components absoluteURI = scheme ":" ( hier-part / opaque-part ) hier-part = ( net-path / abs-path ) [ "?" query ] net-path = "//" authority [ abs-path ] abs-path = "/" path-segments opaque-part = urlc-no-slash *urlc urlc-no-slash = unreserved / escaped / ";" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / "," ;;;; 3.1. Scheme Component scheme = alpha *( alpha / digit / "+" / "-" / "." ) ;;;; 3.2. Authority Component authority = server / reg-name ;;;; Registry-based Naming Authority reg-name = 1*( unreserved / escaped / "$" / "," / ";" / ":" / "@" / "&" / "=" / "+" ) ;;;; 3.2.2. Server-based Naming Authority server = [ [ userinfo "@" ] hostport ] userinfo = *( unreserved / escaped / ";" / ":" / "&" / "=" / "+" / "$" / "," ) hostport = host [ ":" port ] host = hostname / IPv4address hostname = *( domainlabel "." ) toplabel [ "." ] domainlabel = alphanum / alphanum *( alphanum / "-" ) alphanum toplabel = alpha / alpha *( alphanum / "-" ) alphanum IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit port = *digit ;;;; 3.3. Path Component path = [ abs-path / opaque-part ] path-segments = segment *( "/" segment ) segment = *pchar *( ";" param ) param = *pchar pchar = unreserved / escaped / ":" / "@" / "&" / "=" / "+" / "$" / "," ;;;; 3.4. Query Component query = *urlc ;;;; 4. URI References URI-reference = [ absoluteURI / relativeURI ] [ "#" fragment ] ;;;; 4.1. Fragment Identifier fragment = *urlc ;;;; 5. Relative URI References relativeURI = ( net-path / abs-path / rel-path ) [ "?" query ] rel-path = rel-segment [ abs-path ] rel-segment = 1*( unreserved / escaped / ";" / "@" / "&" / "=" / "+" / "$" / "," ) ;--------------------------------------------------------------------------------------------------------- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; ; HTTP digest authentication (2617) - ABNF ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;; 1.2 Access Authentication Framework auth-scheme = token auth-param = token "=" ( token / quoted-string ) challenge = auth-scheme 1*SP auth-param *(COMMA auth-param) realm = "realm" "=" realm-value realm-value = quoted-string ;;;; 2 Basic Authentication Scheme basic-challenge = "Basic" realm basic-credentials = "Basic" basic-credentials-value basic-credentials-value = base64-user-pass base64-user-pass = token ; user-pass = userid ":" password userid = *TEXT ;* password = *TEXT ;;;; 3.2.1 The WWW-Authenticate Response Header ;challenge = "Digest" digest-challenge digest-challenge = digest-challenge-value *(COMMA digest-challenge-value) digest-challenge-value = ( realm / [ domain ] / nonce / [ opaque ] /[ stale ] / [ algorithm ] / [ qop-options ] / [auth-param] ) domain = "domain" "=" <"> URI ( 1*SP URI ) <"> URI = absoluteURI / abs-path nonce = "nonce" "=" nonce-value nonce-value = quoted-string opaque = "opaque" "=" quoted-string stale = "stale" "=" ( "true" / "false" ) algorithm = "algorithm" "=" ( "MD5" / "MD5-sess" / token ) qop-options = "qop" "=" DQUOTE qop-value *(COMMA qop-value) DQUOTE qop-value = "auth" / "auth-int" / token ;;;; 3.2.2 The Authorization Request Header credentials = "Digest" digest-response digest-response = digest-response-value *(COMMA digest-response-value) digest-response-value = ( username / realm / nonce / digest-url / auth-response / [ algorithm ] / [cnonce] / [opaque] / [message-qop] / [nonce-count] / [auth-param] ) username = "username" "=" username-value username-value = quoted-string digest-url = "url" "=" digest-url-value digest-url-value = request-url ; As specified by HTTP/1.1 message-qop = "qop" "=" qop-value cnonce = "cnonce" "=" cnonce-value cnonce-value = nonce-value nonce-count = "nc" "=" nc-value nc-value = 8LHEX auth-response = "response" "=" request-digest request-digest = DQUOTE 32LHEX DQUOTE LHEX = "0" / "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9" / "a" / "b" / "c" / "d" / "e" / "f" ;;;; 3.2.3 The Authentication-Info Header AuthenticationInfo = "Authentication-Info" ":" auth-info auth-info = auth-info-value *(COMMA auth-info-value) auth-info-value = (nextnonce / [ message-qop ] / [ response-auth ] / [ cnonce ] / [nonce-count] ) nextnonce = "nextnonce" "=" nonce-value response-auth = "rspauth" "=" response-digest response-digest = DQUOTE *LHEX DQUOTE ;--------------------------------------------------------------------------------------------------------- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; ; HTTP (2616) - ABNF ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; HT = %x09; separators = "(" / ")" / "<" / ">" / "@" / "," / ";" / ":" / "\" / DQUOTE / "/" / "[" / "]" / "?" / "=" / "{" / "}" / SP / HTAB token = 1*( alphanum / separators ) ; * LWS = [*WSP CRLF] 1*WSP ; linear whitespace SWS = [LWS] ; sep whitespace TEXT = 1*(token / LWS) ; COMMA = SWS "," SWS ; comma ;;;; text (from http ==> is it right?) TEXT-UTF8-TRIM = 1*TEXT-UTF8char *(*LWS TEXT-UTF8char) TEXT-UTF8char = %x21-7E / UTF8-NONASCII UTF8-NONASCII = %xC0-DF 1UTF8-CONT / %xE0-EF 2UTF8-CONT / %xF0-F7 3UTF8-CONT / %xF8-FB 4UTF8-CONT / %xFC-FD 5UTF8-CONT UTF8-CONT = %x80-BF comment = "(" *( ctext / quoted-pair / comment ) ")" ctext = %x21-27 / %x2A-5B / %x5D-7E / UTF8-NONASCII / LWS ; ;;;; quoted-string quoted-string = ( DQUOTE *(qdtext / quoted-pair ) DQUOTE ) qdtext = LWS / %x21 / %x23-5B / %x5D-7E / UTF8-NONASCII ; quoted-pair = "\" CHAR ;;;; HTTP-Version HTTP-Version = "HTTP" "/" 1*DIGIT "." 1*DIGIT ;;;; HTTP-date HTTP-date = rfc1123-date / rfc850-date / asctime-date rfc1123-date = wkday "," SP date1 SP time SP "GMT" rfc850-date = weekday "," SP date2 SP time SP "GMT" asctime-date = wkday SP date3 SP time SP 4DIGIT date1 = 2DIGIT SP month SP 4DIGIT ; day month year (e.g., 02 Jun 1982) date2 = 2DIGIT "-" month "-" 2DIGIT ; day-month-year (e.g., 02-Jun-82) date3 = month SP ( 2DIGIT / ( SP 1DIGIT )) ; month day (e.g., Jun 2) time = 2DIGIT ":" 2DIGIT ":" 2DIGIT ; 00:00:00 - 23:59:59 wkday = "Mon" / "Tue" / "Wed" / "Thu" / "Fri" / "Sat" / "Sun" weekday = "Monday" / "Tuesday" / "Wednesday" / "Thursday" / "Friday" / "Saturday" / "Sunday" month = "Jan" / "Feb" / "Mar" / "Apr" / "May" / "Jun" / "Jul" / "Aug" / "Sep" / "Oct" / "Nov" / "Dec" ;;;; 3.3.2 Delta Seconds delta-seconds = 1*DIGIT ;;;; 3.4 Character Sets charset = token ;;;; 3.5 Content Codings content-coding = token ;;;; 3.6 Transfer Codings transfer-coding = "chunked" / transfer-extension transfer-extension = token *( ";" parameter ) parameter = attribute "=" value attribute = token value = token / quoted-string ;;;; 3.6.1 Chunked Transfer Coding Chunked-Body = *chunk last-chunk chunck-trailer CRLF chunk = chunk-size [ chunk-extension ] CRLF chunk-data CRLF chunk-size = 1*HEX last-chunk = 1*("0") [ chunk-extension ] CRLF chunk-extension= *( ";" chunk-ext-name [ "=" chunk-ext-val ] ) chunk-ext-name = token chunk-ext-val = token / quoted-string chunk-data = chunk-size chunck-trailer = *(entity-header CRLF) ;;;; 3.7 Media Types media-type = type "/" subtype *( ";" parameter ) type = token subtype = token ;;;; 3.8 Product Tokens product = token ["/" product-version] product-version = token ;;;;3.9 Quality Values qvalue = ( "0" [ "." 0*3DIGIT ] ) / ( "1" [ "." 0*3("0") ] ) ;;;; 3.10 Language Tags language-tag = primary-tag *( "-" subtag ) primary-tag = 1*8ALPHA subtag = 1*8ALPHA ;;;; 3.11 Entity Tags entity-tag = [ weak ] opaque-tag weak = "W/" opaque-tag = quoted-string ;;;; 3.12 Range Units range-unit = bytes-unit / other-range-unit bytes-unit = "bytes" other-range-unit = token ;;;; 4.1 Message Types HTTP-message = Request / Response ; HTTP/1.1 messages generic-message = start-line *(message-header CRLF) CRLF [ message-body ] start-line = Request-Line / Status-Line ;;;;4.2 Message Headers message-header = field-name ":" [ field-value ] field-name = token field-value = *( field-content / LWS ) field-content = token ; ;;;; 4.3 Message Body message-body = entity-body ;/ ;;;; 4.5 General Header Fields general-header = Cache-Control / Connection / Date / Pragma / Trailer / Transfer-Encoding / Upgrade / Via / Warning ;Cache-Control = "Cache-Control" ":" [ field-value ] ;Connection = "Connection" ":" [ field-value ] ;Date = "Date" ":" [ field-value ] ;Pragma = "Pragma" ":" [ field-value ] ;Trailer = "Trailer" ":" [ field-value ] ;Transfer-Encoding = "Transfer-Encoding" ":" [ field-value ] ;Upgrade = "Upgrade" ":" [ field-value ] ;Via = "Via" ":" [ field-value ] ;Warning = "Warning" ":" [ field-value ] ;;;; 5 Request Request = Request-Line *(( general-header / request-header / entity-header ) CRLF) CRLF [ message-body ] ;;;; 5.1 Request-Line Request-Line = Method SP Request-URI SP HTTP-Version CRLF ;;;; 5.1.1 Method Method = "OPTIONS" / "GET" / "HEAD" / "POST" / "PUT" / "DELETE" / "TRACE" / "CONNECT" / extension-method extension-method = token ;;;; 5.1.2 Request-URI Request-URI = "*" / absoluteURI / abs-path / authority ;;;; 5.3 Request Header Fields request-header = Accept / Accept-Charset / Accept-Encoding / Accept-Language / Authorization / Expect / From / Host / If-Match / If-Modified-Since / If-None-Match / If-Range / If-Unmodified-Since / Max-Forwards / Proxy-Authorization / Range / Referer / TE / User-Agent ;;;; 6 Response Response = Status-Line *(( general-header / response-header / entity-header ) CRLF) CRLF [ message-body ] ;;;; 6.1 Status-Line Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF ;;;; 6.1.1 Status Code and Reason Phrase Status-Code = "100" / "101" / "200" / "201" / "202" / "203" / "204" / "205" / "206" / "300" / "301" / "302" / "303" / "304" / "305" / "307" / "400" / "401" / "402" / "403" / "404" / "405" / "406" / "407" / "408" / "409" / "410" / "411" / "412" / "413" / "414" / "415" / "416" / "417" / "500" / "501" / "502" / "503" / "504" / "505" / extension-code extension-code = 3DIGIT Reason-Phrase = *( reserved / unreserved / escaped / UTF8-NONASCII / UTF8-CONT / SP / HTAB ) ;* ;;;; 6.2 Response Header Fields response-header = Accept-Ranges / Age / ETag / Location / Proxy-Authenticate / Retry-After / Server / Vary / WWW-Authenticate ;;;; 7.1 Entity Header Fields entity-header = Allow / Content-Encoding / Content-Language / Content-Length / Content-Location / Content-MD5 / Content-Range / Content-Type / Expires / Last-Modified / extension-header extension-header = message-header ;;;; 7.2 Entity Body entity-body = *OCTET ;;;; 7.2.1 Type ;entity-body := Content-Encoding( Content-Type( data ) ) ;;;; 14.1 Accept Accept = "Accept" ":" [ media-range [ accept-params ] ] media-range = ( "*/*" / ( type "/" "*" ) / ( type "/" subtype )) *( ";" parameter ) accept-params = ";" "q" "=" qvalue *( accept-extension ) accept-extension = ";" token [ "=" ( token / quoted-string ) ] ;;;; 14.2 Accept-Charset Accept-Charset = "Accept-Charset" ":" Accept-Charset-Value *(COMMA Accept-Charset-Value) Accept-Charset-Value = token;FIXME:( charset / "*" )[ ";" "q" "=" qvalue ] ) ;;;; 14.3 Accept-Encoding Accept-Encoding = "Accept-Encoding" ":" Accept-Encoding-Value *(COMMA Accept-Encoding-Value) Accept-Encoding-Value = ( codings [ ";" "q" "=" qvalue ] ) codings = ( content-coding / "*" ) ;;;; 14.4 Accept-Language Accept-Language = "Accept-Language" ":" Accept-Language-Value *(COMMA Accept-Language-Value) Accept-Language-Value = ( language-range [ ";" "q" "=" qvalue ] ) language-range = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) / "*" ) ;;;; 14.5 Accept-Ranges Accept-Ranges = "Accept-Ranges" ":" acceptable-ranges acceptable-ranges = (range-unit *(COMMA range-unit)) / "none" ;;;; 14.6 Age Age = "Age" ":" age-value age-value = delta-seconds ;;;; 14.7 Allow Allow = "Allow" ":" [Method] ;;;; 14.8 Authorization Authorization = "Authorization" ":" credentials ;;;; 14.9 Cache-Control Cache-Control = "Cache-Control" ":" cache-directive *(COMMA cache-directive) cache-directive = cache-request-directive / cache-response-directive cache-request-directive = "no-cache" / "no-store" / "max-age" "=" delta-seconds / "max-stale" [ "=" delta-seconds ] / "min-fresh" "=" delta-seconds / "no-transform" / "only-if-cached" / cache-extension cache-response-directive = "public" / "private" [ "=" DQUOTE field-name *(COMMA field-name) DQUOTE ] / "no-cache" [ "=" DQUOTE field-name *(COMMA field-name) DQUOTE ] / "no-store" / "no-transform" / "must-revalidate" / "proxy-revalidate" / "max-age" "=" delta-seconds / "s-maxage" "=" delta-seconds / cache-extension cache-extension = token [ "=" ( token / quoted-string ) ] ;;;; 14.9.6 Cache Control Extensions ;Cache-Control: private, community="UCI" ;;;; 14.10 Connection Connection = "Connection" ":" (connection-token) *(COMMA connection-token) connection-token = token ;;;; 14.11 Content-Encoding Content-Encoding = "Content-Encoding" ":" content-coding *(COMMA content-coding) ;;;; 14.12 Content-Language Content-Language = "Content-Language" ":" language-tag *(COMMA language-tag) ;;;; 14.13 Content-Length Content-Length = "Content-Length" ":" 1*DIGIT ;;;; 14.14 Content-Location Content-Location = "Content-Location" ":" ( absoluteURI / relativeURI ) ;;;; 14.15 Content-MD5 Content-MD5 = "Content-MD5" ":" md5-digest md5-digest = *OCTET ; ;;;; 14.16 Content-Range Content-Range = "Content-Range" ":" content-range-spec content-range-spec = byte-content-range-spec byte-content-range-spec = bytes-unit SP byte-range-resp-spec "/" ( instance-length / "*" ) byte-range-resp-spec = (first-byte-pos "-" last-byte-pos) / "*" instance-length = 1*DIGIT ;;;; 14.17 Content-Type Content-Type = "Content-Type" ":" media-type ;;;; 14.18 Date Date = "Date" ":" HTTP-date ;;;; 14.19 ETag ETag = "ETag" ":" entity-tag ;;;; 14.20 Expect Expect = "Expect" ":" expectation *(COMMA expectation) expectation = "100-continue" / expectation-extension expectation-extension = token [ "=" ( token / quoted-string ) *expect-params ] expect-params = ";" token [ "=" ( token / quoted-string ) ] ;;;; 14.21 Expires Expires = "Expires" ":" HTTP-date ;;;; 14.22 From From = "From" ":" mailbox mailbox = token ; FIXME ;;;; 14.23 Host Host = "Host" ":" host [ ":" port ] ; Section 3.2.2 ;;;; 14.24 If-Match If-Match = "If-Match" ":" ( "*" / entity-tag *(COMMA entity-tag) ) ;;;; 14.25 If-Modified-Since If-Modified-Since = "If-Modified-Since" ":" HTTP-date ;;;; 14.26 If-None-Match If-None-Match = "If-None-Match" ":" ( "*" / entity-tag *(COMMA entity-tag) ) ;;;; 14.27 If-Range If-Range = "If-Range" ":" ( entity-tag / HTTP-date ) ;;;; 14.28 If-Unmodified-Since If-Unmodified-Since = "If-Unmodified-Since" ":" HTTP-date ;;;; 14.29 Last-Modified Last-Modified = "Last-Modified" ":" HTTP-date ;;;; 14.30 Location Location = "Location" ":" absoluteURI ;;;; 14.31 Max-Forwards Max-Forwards = "Max-Forwards" ":" 1*DIGIT ;;;; 14.32 Pragma Pragma = "Pragma" ":" pragma-directive *(COMMA pragma-directive) pragma-directive = "no-cache" / extension-pragma extension-pragma = token [ "=" ( token / quoted-string ) ] ;;;; 14.33 Proxy-Authenticate Proxy-Authenticate = "Proxy-Authenticate" ":" challenge *(COMMA challenge) ;;;; 14.34 Proxy-Authorization Proxy-Authorization = "Proxy-Authorization" ":" credentials ;;;; 14.35.1 Byte Ranges ranges-specifier = byte-ranges-specifier byte-ranges-specifier = bytes-unit "=" byte-range-set byte-range-set = byte-range-set-value *(COMMA byte-range-set-value) byte-range-set-value = ( byte-range-spec / suffix-byte-range-spec ) byte-range-spec = first-byte-pos "-" [last-byte-pos] first-byte-pos = 1*DIGIT last-byte-pos = 1*DIGIT suffix-byte-range-spec = "-" suffix-length suffix-length = 1*DIGIT ;;;; 14.35.2 Range Retrieval Requests Range = "Range" ":" ranges-specifier ;;;; 14.36 Referer Referer = "Referer" ":" ( absoluteURI / relativeURI ) ;;;; 14.37 Retry-After Retry-After = "Retry-After" ":" ( HTTP-date / delta-seconds ) ;;;; 14.38 Server Server = "Server" ":" 1*( product / comment ) ;;;; 14.39 TE TE = "TE" ":" [t-codings *(COMMA t-codings)] t-codings = "trailers" / ( transfer-extension [ accept-params ] ) ;;;; 14.40 Trailer Trailer = "Trailer" ":" field-name *(COMMA field-name) ;;;; 14.41 Transfer-Encoding Transfer-Encoding = "Transfer-Encoding" ":" transfer-coding *(COMMA transfer-coding) ;;;; 14.42 Upgrade Upgrade = "Upgrade" ":" product *(COMMA product) ;;;; 14.43 User-Agent User-Agent = "User-Agent" ":" 1*( product / comment ) ;;;; 14.44 Vary Vary = "Vary" ":" ( "*" / field-name *(COMMA field-name) ) ;;;; 14.45 Via Via = "Via" ":" Via-Value *(COMMA Via-Value) Via-Value = ( received-protocol received-by [ comment ] ) received-protocol = [ protocol-name "/" ] protocol-version protocol-name = token protocol-version = token received-by = ( host [ ":" port ] ) / pseudonym pseudonym = token ;;;; 14.46 Warning Warning = "Warning" ":" warning-value *(COMMA warning-value) warning-value = warn-code SP warn-agent SP warn-text [SP warn-date] warn-code = 3DIGIT warn-agent = ( host [ ":" port ] ) / pseudonym ; the name or pseudonym of the server adding ; the Warning header, for use in debugging warn-text = quoted-string warn-date = DQUOTE HTTP-date DQUOTE ;;;; 14.47 WWW-Authenticate WWW-Authenticate = "WWW-Authenticate" ":" challenge *(COMMA challenge)