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Content-Location報頭指示為返回的數(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Content-Location指示用于訪問資源的直接 URL ，而未來未進(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)。沒有示例，這種區(qū)分看起來很抽象。

Header type

Entity header

Forbidden header name

no

語法

Content-Location: <url>

指令

<url> 相對于（請求 URL ）或絕對 URL 。

例子

以不同格式從服務(wù)器請求數(shù)據(jù)

假設(shè)一個網(wǎng)站的 API 可以以 JSON ，XML 或 CSV 格式返回數(shù)據(jù)。如果特定文檔的 URL 位于https://example.com/documents/foo，網(wǎng)站可能會返回不同的 URL 以Content-Location取決于請求的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，在下次請求文檔時跳過內(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。

指向一個新文檔（ HTTP 201創(chuàng)建）

假設(shè)您正在通過網(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)站會為交易生成收據(jù)。服務(wù)器可以用Content-Location來指示收據(jù)的 URL 以供將來訪問。

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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