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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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非标准Large-Allocation响应头告诉浏览器正在加载的页面将要执行大量分配。它目前只在 Firefox 中实现，但对每个浏览器都是无害的。

WebAssembly 或 asm.js 应用程序可以使用大量连续的已分配内存块。例如，对于复杂的游戏，这些分配可能非常大，有时高达1GB。的Large-Allocation讲述，在待加载的页面的 web 内容将要要执行大的连续存储器分配的浏览器和浏览器可以通过启动一个专门处理为要被加载的文件到此接头反应，如下例。

Header type

Response header

Forbidden header name

no

句法

Large-Allocation: 0Large-Allocation:

指令

0是一个特殊值，它表示分配的大小是不确定的。要执行的分配的预期大小，以兆字节为单位。

例子

Large-Allocation: 0Large-Allocation: 500

排除错误

Large-Allocation不正确使用时头引发警告或错误消息。您将在 Web控制台中 遇到它们。

这个页面由于头文件而被加载到一个新的进程中。这个Large-Allocation消息意味着浏览器看到了Large-Allocation头文件，并且能够将页面重新加载到一个新的进程中，该进程应该有更多可用的连续内存。Large-Allocation由于加载由非GET请求触发。当POST使用请求来加载文档时，该加载当前不能被重定向到新的进程中。Large-Allocation使用非GET HTTP方法加载包含标题的文档时，会显示此错误。这可能是由于文档通过表单提交加载引起的。例如，由于Large-Allocation存在通过框架层次结构引用此浏览上下文的窗口，因此标头被忽略window.opener。

错误表示文档未加载到用户打开或未打开打开的选项卡或窗口的顶层。它可能发生在这些情况下：

  • 带有Large-Allocation标题的文档被加载到一个