HTTP 中文开发手册
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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

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characters

Content-Type实体头用于指示所述媒体类型的资源的。

作为响应，Content-Type标题告诉客户实际返回的内容的内容类型。浏览器在某些情况下会执行 MIME 嗅探，并不一定会遵循此标头的值; 为了防止这种行为，X-Content-Type-Options可以将标题设置为nosniff。

在请求（例如POST或PUT）中，客户端通知服务器实际发送了什么类型的数据。

Header type

Entity header

Forbidden header name

no

CORS-safelisted response-header

yes

语法

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

指令

media-type资源的 MIME 类型或 data.charset 字符编码标准。边界对于多部分实体，boundary指令是必需的，它由1到70个字符组成，这些字符通过电子邮件网关已知非常强大，并且不以空格结尾。它用于封装消息多个部分的边界。

例子

Content-Type 在 HTML 表单中

在POST来自 HTML 表单提交Content-Type的请求中，请求的内容由元素enctype上的属性指定<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>

这个请求看起来像这样（这里省略了一些有趣的标题）：

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

规范

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

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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