#) です
,
* ; q Q = identity q
Accept-Encoding:
ヘッダーに
br,
gzip,
deflate
の1つ
*
identity *;
が指定されている場合を除き、受け入れられます。
q q 406 406 Accept-Encoding: .tar.gz Accept-Encoding:
The Accept-Encoding request-header field is similar to Accept, but restricts the
{1945,2068} content-coding values {2068} (section 14.12) which{2616} content-codings (section 3.5) that are acceptable in the response.
Accept-Encoding 応答頭欄は、
{2068,2616}
{2068}Accept-Encoding = "Accept-Encoding" ":" #( content-coding )- {2616}
Accept-Encoding = "Accept-Encoding" ":" 1#( codings [ ";" "q" "=" qvalue ] )- {2616}
codings = ( content-coding | "*" )
{2068} An example of its use is{2616} Examples of its use are:
- Accept-Encoding: compress, gzip
- {2616} Accept-Encoding:
- {2616} Accept-Encoding: *
- {2616} Accept-Encoding: compress;q=0.5, gzip;q=1.0
- {2616} Accept-Encoding: gzip;q=1.0, identity; q=0.5, *;q=0
{2616} A server tests whether a content-coding is acceptable, according to an Accept-Encoding field, using these rules:
- 1. If the content-coding is one of the content-codings listed in the Accept-Encoding field, then it is acceptable, unless it is accompanied by a qvalue of 0. (As defined in section 3.9, a qvalue of 0 means "not acceptable.")
- 2. The special "*" symbol in an Accept-Encoding field matches any available content-coding not explicitly listed in the header field.
- 3. If multiple content-codings are acceptable, then the acceptable content-coding with the highest non-zero qvalue is preferred.
- 4. The "identity" content-coding is always acceptable, unless specifically refused because the Accept-Encoding field includes "identity;q=0", or because the field includes "*;q=0" and does not explicitly include the "identity" content-coding. If the Accept-Encoding field-value is empty, then only the "identity" encoding is acceptable.
サーバーは、 Accept-Encoding 欄に従い、次の規則を使って
content-coding が受け入れ可能かを検査します:
Accept-Encoding 欄に列挙された content-coding
なら、その 0 でない限りは受入れ可能です。
(3.9 節で定義したように、 qvalue 0 は「受入れ不能」を意味します。)Accept-Encoding 欄中の特殊な * 記号は、
頭欄中に陽に列挙されていない利用可能な content-coding に一致します。identity content-coding は、 Accept-Encoding 欄がidentity;q=0 を含むか、 *;q=0
を含んで identity content-coding を陽に含んでいないために特に断られていない限り、
常に受入れ可能です。 Accept-Encoding 欄値が空の場合、
identity 符号化だけが受入れ可能です。If an Accept-Encoding field is present in a request, and if the server cannot send a response which is acceptable according to the Accept-Encoding header, then the server SHOULD send an error response with the 406 (Not Acceptable) status code.
Accept-Encoding 欄が要求に示されている場合、
そしてサーバーが Accept-Encoding 頭に従って受入れ可能な応答を送れない場合は、
サーバーは
If no Accept-Encoding field is present in a request, the server MAY assume that the client will accept any content coding. {2616} In this case, if "identity" is one of the available content-codings, then the server SHOULD use the "identity" content-coding, unless it has additional information that a different content-coding is meaningful to the client.
{2068} If an Accept-Encoding header is present, and if the server cannot send a response which is acceptable according to the Accept-Encoding header, then the server SHOULD send an error response with the 406 (Not Acceptable) status code.
Accept-Encoding 欄が要求中に示されていない場合、
サーバーはクライアントがどの内容符号かも受け入れると仮定しても構いません。 {2616} この場合、 identity が利用可能な content-coding の1つであれば、クライアントにはこれ以外の content-coding に意味があるという追加の情報がない限り、サーバーは identity content-coding を使用するべきです。 {2068} Accept-Encoding 頭が示されている場合、そしてサーバーが Accept-Encoding 頭に従って受入れ可能な応答を送れない場合は、サーバーは
{2068} An empty Accept-Encoding value indicates none are acceptable.
空の Accept-Encoding 値は、どれも受け入れ可能でないことを示します。
{2616} Note: If the request does not include an Accept-Encoding field, and if the "identity" content-coding is unavailable, then content-codings commonly understood by HTTP/1.0 clients (i.e., "gzip" and "compress") are preferred; some older clients improperly display messages sent with other content-codings. The server might also make this decision based on information about the particular user-agent or client.
Note: Most HTTP/1.0 applications do not recognize or obey qvalues associated with content-codings. This means that qvalues will not work and are not permitted with x-gzip or x-compress.
注意 : 要求が identity content-coding が利用可能で無い場合、
HTTP/1.0 クライアントが広く理解可能な content-coding
(すなわち
注意 : ほとんどの HTTP/1.1 応用は content-coding
に関連付けられた qvalue を認識したり従ったりしません。
これは、 qvalue が
Options | General Preferences | Language "Accept Language" enables the user to select a prioritized list of language/region codes that reflect what language a user wishes to display a document in, if that document is available in different language translations. The "accept language" information is contained in the HTTP Header's HTTP_ACCEPT_LANGUAGE. A server that provides different language versions of the same content could thus accommodate a user's preferred language.