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Guides Access control CORS Authentication Browser detection using the user agent Caching Caching FAQ Compression Conditional requests Connection management in HTTP 1.x Content negotiation Content negotiation: List of default Accept values Cookies CSP Messages Overview Protocol upgrade mechanism Proxy servers and tunneling Proxy servers and tunneling: Proxy Auto-Configuration (PAC) file Public Key Pinning Range requests Redirections Resources and specifications Resources and URIs Response codes Server-Side Access Control Session Guides: Basics Basics of HTTP Choosing between www and non-www URLs Data URIs Evolution of HTTP Identifying resources on the Web MIME Types MIME types: Complete list of MIME types CSP Content-Security-Policy Content-Security-Policy-Report-Only CSP: base-uri CSP: block-all-mixed-content CSP: child-src CSP: connect-src CSP: default-src CSP: font-src CSP: form-action CSP: frame-ancestors CSP: frame-src CSP: img-src CSP: manifest-src CSP: media-src CSP: object-src CSP: plugin-types CSP: referrer CSP: report-uri CSP: require-sri-for CSP: sandbox CSP: script-src CSP: style-src CSP: upgrade-insecure-requests CSP: worker-src Headers Accept Accept-Charset Accept-Encoding Accept-Language Accept-Ranges Access-Control-Allow-Credentials Access-Control-Allow-Headers Access-Control-Allow-Methods Access-Control-Allow-Origin Access-Control-Expose-Headers Access-Control-Max-Age Access-Control-Request-Headers Access-Control-Request-Method Age Allow Authorization Cache-Control Connection Content-Disposition Content-Encoding Content-Language Content-Length Content-Location Content-Range Content-Type Cookie Cookie2 Date DNT ETag Expect Expires Forwarded From Headers Host If-Match If-Modified-Since If-None-Match If-Range If-Unmodified-Since Keep-Alive Large-Allocation Last-Modified Location Origin Pragma Proxy-Authenticate Proxy-Authorization Public-Key-Pins Public-Key-Pins-Report-Only Range Referer Referrer-Policy Retry-After Server Set-Cookie Set-Cookie2 SourceMap Strict-Transport-Security TE Tk Trailer Transfer-Encoding Upgrade-Insecure-Requests User-Agent User-Agent: Firefox Vary Via Warning WWW-Authenticate X-Content-Type-Options X-DNS-Prefetch-Control X-Forwarded-For X-Forwarded-Host X-Forwarded-Proto X-Frame-Options X-XSS-Protection Methods CONNECT DELETE GET HEAD Methods OPTIONS PATCH POST PUT Status 100 Continue 101 Switching Protocols 200 OK 201 Created 202 Accepted 203 Non-Authoritative Information 204 No Content 205 Reset Content 206 Partial Content 300 Multiple Choices 301 Moved Permanently 302 Found 303 See Other 304 Not Modified 307 Temporary Redirect 308 Permanent Redirect 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 405 Method Not Allowed 406 Not Acceptable 407 Proxy Authentication Required 408 Request Timeout 409 Conflict 410 Gone 411 Length Required 412 Precondition Failed 413 Payload Too Large 414 URI Too Long 415 Unsupported Media Type 416 Range Not Satisfiable 417 Expectation Failed 426 Upgrade Required 428 Precondition Required 429 Too Many Requests 431 Request Header Fields Too Large 451 Unavailable For Legal Reasons 500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable 504 Gateway Timeout 505 HTTP Version Not Supported 511 Network Authentication Required Status
watak

Transfer-Encoding头指定用于将安全地传输编码的形式的实体提供给用户。

Transfer-Encoding是一种逐跳报头,即应用于两个节点之间的消息,而不是资源本身。多节点连接的每个段可以使用不同的Transfer-Encoding值。如果要在整个连接上压缩数据,请改为使用端到端标Content-Encoding头。

当出现在对HEAD没有主体的请求的响应中时,它指示将应用于相应GET消息的值。

Header type

Response header

Forbidden header name

yes

句法

Transfer-Encoding: chunked
Transfer-Encoding: compress
Transfer-Encoding: deflate
Transfer-Encoding: gzip
Transfer-Encoding: identity// Several values can be listed, separated by a commaTransfer-Encoding: gzip, chunked

指令

chunked数据以一系列块的形式发送。该Content-Length标题省略在这种情况下,并在每个需要添加十六进制格式的当前块的长度,其次是块“的开始\r\n”,然后是块本身,紧接着又“ \r\n”。终止块是一个常规块,除长度为零外。其后是拖车,它由一个(可能是空的)实体标题字段序列组成。compress使用 Lempel-Ziv-Welch(LZW)算法的格式。值名取自实施此算法的 UNIX 压缩程序。

与大多数 UNIX 发行版已经消失的压缩程序一样,目前几乎没有浏览器使用这种内容编码,部分原因是由于专利问题(已在2 003年过期)。deflate使用 deflate 压缩算法(在RFC 1951中定义)使用zlib结构(在RFC 1950中定义)。一种使用Lempel-Ziv编码(LZ77)和32位 CRC  的格式。这最初是 UNIX gzip 程序的格式。为了兼容性的目的,HTTP / 1.1 标准还建议支持该内容编码的服务器应该将其识别为别名。gzipx-gzipidentity指示身份功能(即不压缩,也不修改)。除非明确指定,否则此标记始终被视为可接受。

例子

分块编码

当大量数据发送到客户端时,分块编码非常有用,并且在请求完全处理之前可能不知道响应的总大小。例如,生成从数据库查询产生的大型 HTML 表格或传输大型图像时。分块的响应如下所示:

HTTP/1.1 200 OK 
Content-Type: text/plain 
Transfer-Encoding: chunked7\r\n
Mozilla\r\n 
9\r\n
Developer\r\n7\r\n
Network\r\n0\r\n 
\r\n

产品规格

Specification

Title

RFC 7230, section 3.3.1: Transfer-Encoding

Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing

浏览器兼容性

Feature

Chrome

Edge

Firefox

Internet Explorer

Opera

Safari

Basic Support

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

Feature

Android

Chrome for Android

Edge mobile

Firefox for Android

IE mobile

Opera Android

iOS Safari

Basic Support

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

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