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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
Figuren

Content-Location報(bào)頭指示為返回的數(shù)據(jù)的備用位置。主要用途是指示作為內(nèi)容協(xié)商結(jié)果傳輸?shù)馁Y源的 URL 。

Location和Content-Location是不同的。

Location指示重定向的 URL ，同時(shí)Content-Location指示用于訪問(wèn)資源的直接 URL ，而未來(lái)未進(jìn)一步內(nèi)容協(xié)商。

Location是與響應(yīng)關(guān)聯(lián)的頭部，Content-Location與返回的數(shù)據(jù)相關(guān)聯(lián)。沒(méi)有示例，這種區(qū)分看起來(lái)很抽象。

Header type

Entity header

Forbidden header name

no

語(yǔ)法

Content-Location: <url>

指令

<url> 相對(duì)于（請(qǐng)求 URL ）或絕對(duì) URL 。

例子

以不同格式從服務(wù)器請(qǐng)求數(shù)據(jù)

假設(shè)一個(gè)網(wǎng)站的 API 可以以 JSON ，XML 或 CSV 格式返回?cái)?shù)據(jù)。如果特定文檔的 URL 位于https://example.com/documents/foo，網(wǎng)站可能會(huì)返回不同的 URL 以Content-Location取決于請(qǐng)求的Accept標(biāo)題：

Request header

Response header

Accept: application/json, text/json

Content-Location: /documents/foo.json

Accept: application/xml, text/xml

Content-Location: /documents/foo.xml

Accept: text/plain, text/*

Content-Location: /documents/foo.txt

這些 URL 是示例 - 該網(wǎng)站可以使用它希望的任何 URL 模式來(lái)提供不同的文件類型，例如查詢字符串參數(shù)：/documents/foo?format=json，/documents/foo?format=xml等等。

然后，客戶端可以記住 JSON 版本在該特定的 URL 上可用，在下次請(qǐng)求文檔時(shí)跳過(guò)內(nèi)容協(xié)商。

服務(wù)器也可以考慮其他內(nèi)容協(xié)商頭，例如Accept-Language。

指向一個(gè)新文檔（ HTTP 201創(chuàng)建）

假設(shè)您正在通過(guò)網(wǎng)站的 API 創(chuàng)建新博客帖子：

PUT /new/post
Host: example.com
Content-Type: text/markdown

# My first blog post!I made this through `example.com`'s API. I hope it worked.

該網(wǎng)站返回確認(rèn)帖子已發(fā)布的通用成功消息。服務(wù)器指定其中的新職位是Content-Location：

HTTP/1.1 201 Created
Content-Type: text/plain; charset=utf-8Content-Location: /my-first-blog-post

? Success!

指示交易結(jié)果的網(wǎng)址

假設(shè)您有一筆<form>錢用于網(wǎng)站的其他用戶。

<form action="/send-payment" method="post">  
    <p>    
        <label>Who do you want to send the money to?      <input type="text" name="recipient">    </label>  
    </p>  
    <p>    
        <label>How much?      <input type="number" name="amount">    </label>  
    </p>  
    <button type="submit">Send Money</button>
</form>

表單提交后，網(wǎng)站會(huì)為交易生成收據(jù)。服務(wù)器可以用Content-Location來(lái)指示收據(jù)的 URL 以供將來(lái)訪問(wèn)。

HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8Content-Location: /my-receipts/38<!doctype html>(Lots of HTML…)
<p>You sent $38.00 to ExampleUser.</p>
(Lots more HTML…)

規(guī)范

Specification

Title

RFC 7231, section 3.1.4.2: Content-Location

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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