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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

Content-Type實(shí)體頭用于指示所述媒體類型的資源的。

作為響應(yīng)，Content-Type標(biāo)題告訴客戶實(shí)際返回的內(nèi)容的內(nèi)容類型。瀏覽器在某些情況下會(huì)執(zhí)行 MIME 嗅探，并不一定會(huì)遵循此標(biāo)頭的值; 為了防止這種行為，X-Content-Type-Options可以將標(biāo)題設(shè)置為nosniff。

在請(qǐng)求（例如POST或PUT）中，客戶端通知服務(wù)器實(shí)際發(fā)送了什么類型的數(shù)據(jù)。

Header type

Entity header

Forbidden header name

no

CORS-safelisted response-header

yes

語法

Content-Type: text/html; charset=utf-8Content-Type: multipart/form-data; boundary=something

指令

media-type資源的 MIME 類型或 data.charset 字符編碼標(biāo)準(zhǔn)。邊界對(duì)于多部分實(shí)體，boundary指令是必需的，它由1到70個(gè)字符組成，這些字符通過電子郵件網(wǎng)關(guān)已知非常強(qiáng)大，并且不以空格結(jié)尾。它用于封裝消息多個(gè)部分的邊界。

例子

Content-Type 在 HTML 表單中

在POST來自 HTML 表單提交Content-Type的請(qǐng)求中，請(qǐng)求的內(nèi)容由元素enctype上的屬性指定<form>。

<form action="/" method="post" enctype="multipart/form-data">  
    <input type="text" name="description" value="some text">  
    <input type="file" name="myFile">  
    <button type="submit">Submit</button>
</form>

這個(gè)請(qǐng)求看起來像這樣（這里省略了一些有趣的標(biāo)題）：

POST /foo HTTP/1.1Content-Length: 68137Content-Type: multipart/form-data; boundary=---------------------------974767299852498929531610575---------------------------974767299852498929531610575Content-Disposition: form-data; name="description" some text---------------------------974767299852498929531610575Content-Disposition: form-data; name="myFile"; filename="foo.txt" Content-Type: text/plain (content of the uploaded file foo.txt)---------------------------974767299852498929531610575

規(guī)范

Specification

Title

RFC 7233, section 4.1: Content-Type in multipart

Hypertext Transfer Protocol (HTTP/1.1): Range Requests

RFC 7231, section 3.1.1.5: Content-Type

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

瀏覽器兼容性

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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