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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
characters

Expect HTTP 請求頭表明，需要通過服務(wù)器，以便正確地處理該請求符合預(yù)期。

規(guī)范中定義的唯一期望是Expect: 100-continue，服務(wù)器應(yīng)該以此作為回應(yīng)：

  • 100 如果標(biāo)題中包含的信息足以立即獲得成功，

  • 417（期望失敗），如果它不能達(dá)到預(yù)期; 或者其他任何其他 4xx 狀態(tài)。

例如，如果它的Content-Length太大，服務(wù)器可能會(huì)拒絕一個(gè)請求。

沒有常見的瀏覽器發(fā)送Expect頭文件，但其他一些客戶端（例如 cURL ）默認(rèn)會(huì)這樣做。

Header type

Request header

Forbidden header name

no

語法

目前沒有指定除“100-continue”之外的其他期望。

Expect: 100-continue

指令

100-continue 通知收件人客戶端將在此請求中發(fā)送消息主體100（希望大），并希望接收（繼續(xù)）臨時(shí)響應(yīng)。

例子

大郵件正文

客戶端發(fā)送帶有 Expect 頭的請求，并在發(fā)送消息正文之前等待服務(wù)器作出響應(yīng)。

PUT /somewhere/fun HTTP/1.1Host: origin.example.com
Content-Type: video/h264
Content-Length: 1234567890987Expect: 100-continue

服務(wù)器現(xiàn)在檢查請求標(biāo)題，并可能會(huì)響應(yīng)100（繼續(xù)）響應(yīng)以指示客戶端繼續(xù)并發(fā)送消息正文，或者417如果無法滿足任何期望，它將發(fā)送（期望失敗）狀態(tài)。

規(guī)范

Specification

Title

RFC 7231, section 5.1.1: Expect

Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content

瀏覽器兼容性

已知沒有常見的瀏覽器發(fā)送此標(biāo)頭。

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