510 Not Extended

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HTTP协议的  510 Not Extended 响应状态码在HTTP扩展框架协议（参见RFC 2774）中发送。

在HTTP扩展框架协议中 ，一个客户端可以发送一个包含扩展声明的请求，该声明描述了要使用的扩展。如果服务器接收到这样的请求，但是请求不支持任何所描述的扩展，那么服务器将使用510状态码进行响应。

Status

510 Not Extended

Specifications

Specification Title
RFC 2774, section 7: 510 Not Extended An HTTP Extension Framework
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    1. Accept
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    85. User-Agent
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    89. Want-Digest [我来译!]
    90. Warning
    91. X-Content-Type-Options
    92. X-DNS-Prefetch-Control
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    50. 506 Variant Also Negotiates [我来译!]
    51. 507 Insufficient Storage [我来译!]
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    1. CSP: base-uri
    2. CSP: block-all-mixed-content
    3. CSP: child-src
    4. CSP: connect-src
    5. CSP: default-src
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    20. CSP: require-sri-for
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    22. CSP: script-src [我来译!]
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    24. CSP: script-src-elem [我来译!]
    25. CSP: style-src [我来译!]
    26. CSP: style-src-attr [我来译!]
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    2. 原因：CORS 头 'Access-Control-Allow-Origin'与'xyz'不匹配
    3. Reason: CORS header 'Access-Control-Allow-Origin' missing
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    14. Reason: invalid token ‘xyz’ in CORS header ‘Access-Control-Allow-Methods’ [我来译!]
    15. Reason: missing token ‘xyz’ in CORS header ‘Access-Control-Allow-Headers’ from CORS preflight channel [我来译!]
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    1. Feature-Policy: accelerometer [我来译!]
    2. Feature-Policy: ambient-light-sensor [我来译!]
    3. Feature-Policy: autoplay
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    5. Feature-Policy: camera
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    9. Feature-Policy: fullscreen [我来译!]
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    16. Feature-Policy: midi [我来译!]
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    19. Feature-Policy: picture-in-picture [我来译!]
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    22. Feature-Policy: unoptimized-images [我来译!]
    23. Feature-Policy: unsized-media [我来译!]
    24. Feature-Policy: usb [我来译!]
    25. Feature-Policy: vibrate [我来译!]
    26. Feature-Policy: vr [我来译!]
    27. Feature-Policy: wake-lock [我来译!]
    28. Feature-Policy: xr [我来译!]
    29. Feature-Policy: xr-spatial-tracking [我来译!]