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;
; 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)
;---------------------------------------------------------------------------------------------------------
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;
; 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 = ";" / "/" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
;;;; 2.3. Unreserved Characters
unreserved = alphanum / mark
mark = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")"
;;;; 2.4.1. Escaped Encoding
escaped = "%" hex hex
hex = digit / "A" / "B" / "C" / "D" / "E" / "F" / "a" / "b" / "c" / "d" / "e" / "f"
;;;; 2.4.3. Excluded US-ASCII Characters
control = %x00-1F / %x7F ;<US-ASCII coded characters 00-1F and 7F hexadecimal>
space = %x20 ;<US-ASCII coded character 20 hexadecimal>
delims = "<" / ">" / "#" / "%" / DQUOTE
unwise = "{" / "}" / "/" / "\" / "^" / "[" / "]" / "`"
;;;; 3. URI Syntactic Components
absoluteURI = scheme ":" ( hier-part / opaque-part )
hier-part = ( net-path / abs-path ) [ "?" query ]
net-path = "//" authority [ abs-path ]
abs-path = "/" path-segments
opaque-part = urlc-no-slash *urlc
urlc-no-slash = unreserved / escaped / ";" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
;;;; 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 / ":" / "@" / "&" / "=" / "+" / "$" / ","
;;;; 3.4. Query Component
query = *urlc
;;;; 4. URI References
URI-reference = [ absoluteURI / relativeURI ] [ "#" fragment ]
;;;; 4.1. Fragment Identifier
fragment = *urlc
;;;; 5. Relative URI References
relativeURI = ( net-path / abs-path / rel-path ) [ "?" query ]
rel-path = rel-segment [ abs-path ]
rel-segment = 1*( unreserved / escaped / ";" / "@" / "&" / "=" / "+" / "$" / "," )
;---------------------------------------------------------------------------------------------------------
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;
; 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 ;<base64 [4] encoding of user-pass, except not limited to 76 char/line>
user-pass = userid ":" password
userid = *TEXT ;*<TEXT excluding ":">
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
;---------------------------------------------------------------------------------------------------------
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;
; HTTP (2616) - ABNF
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
HT = %x09; <US-ASCII HT, horizontal-tab (9)>
separators = "(" / ")" / "<" / ">" / "@" / "," / ";" / ":" / "\" / DQUOTE / "/" / "[" / "]" / "?" / "=" / "{" / "}" / SP / HTAB
token = 1*( alphanum / separators ) ; *<any CHAR except CTLs or separators>
LWS = [*WSP CRLF] 1*WSP ; linear whitespace
SWS = [LWS] ; sep whitespace
TEXT = 1*(token / LWS) ; <any OCTET except CTLs, but including 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 ; <any TEXT excluding "(" and ")">
;;;; quoted-string
quoted-string = ( DQUOTE *(qdtext / quoted-pair ) DQUOTE )
qdtext = LWS / %x21 / %x23-5B / %x5D-7E / UTF8-NONASCII ; <any TEXT except DQUOTE>
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 ;<the OCTETs making up the field-value and consisting of either *TEXT or combinations of token, separators, and quoted-string>
;;;; 4.3 Message Body
message-body = entity-body ;/ <entity-body encoded as per Transfer-Encoding>
;;;; 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 ) ;*<TEXT, excluding CR, LF>
;;;; 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 ;<base64 of 128 bit MD5 digest as per RFC 1864>
;;;; 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)