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ABNF for HTTP/1.1 — Hypertext Transfer Protocol
RFCs 7230…35

HTTP/1.1 — Headers

RFC 7231 – Section 5

 

see   RFC 7230 – Section 7   for the  #rule  ABNF List extension
Accept =
#( media-range  [ accept-params ] )
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media-range =
( "*/*"  /  ( type "/"  "*" )  /  ( type "/"  subtype ) )  *( OWS  ";"  OWSparameter )
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accept-params =
weight  *( accept-ext )
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accept-ext =
OWS  ";"  OWStoken  [ "="  ( token  /  quoted‑string ) ]
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Accept-Charset =
1#( ( charset  /  "*" )  [ weight ] )

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Accept-Encoding =
#( codings  [ weight ] )
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codings =
content-coding /  "identity" /  "*"
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Accept-Language =
1#( language-range  [ weight ] )
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language-range =
<language-range, see   RFC 4647Section 2.1>
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Allow =

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ETag =
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entity-tag =
weak ]  opaque-tag
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weak =
%x57.2F
; "W/", case-sensitive
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opaque-tag =
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etagc =
%x21 /  %x23-7E /  obs-text
; VCHAR except double quotes, plus obs-text
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Expect =
"100-continue"

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From =
mailbox

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Host =
uri-host  [ ":"  port ]

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If-Match =
"*" /  1#entity-tag

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If-None-Match =
"*" /  1#entity-tag

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Pragma =
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pragma-directive =
"no-cache" /  extension-pragma
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extension-pragma =
token  [ "="  ( token /  quoted‑string ) ]
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Server =
product  *( RWS  ( product /  comment ) )

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TE =
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t-codings =
"trailers"  /  (  transfer-coding  [ t-ranking ] )
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t-ranking =
OWS  ";"  OWS  "q="  rank
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rank =
(  "0"  [ "."  0*3DIGIT ] )  /  (  "1"  [ "."  0*3( "0" ) ] )
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User-Agent =
product  *( RWS  ( product  /  comment ) )
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product =
token  [ "/"  product-version ]
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product-version =
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Vary =
"*"  /  1#field-name

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Via =
1#( received-protocolRWSreceived-by  [ RWScomment ] )
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received-protocol =
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received-by =
uri-host  [ ":"  port ] )  /  pseudonym
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pseudonym =
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Warning =
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warning-value =
warn-codeSPwarn-agentSPwarn-text  [ SPwarn-date ]
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warn-code =
3DIGIT
; 110   Response is Stale   Section 5.5.1
; 111   Revalidation Failed   Section 5.5.2
; 112   Disconnected Operation   Section 5.5.3
; 113   Heuristic Expiration   Section 5.5.4
; 199   Miscellaneous Warning   Section 5.5.5
; 214   Transformation Applied   Section 5.5.6
; 299   Miscellaneous Persistent Warning   Section 5.5.7
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warn-agent =
uri-host  [ ":"  port ] ) /  pseudonym
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warn-text =
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warn-date =
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