id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_HTTP/HTTP_request_methods_8_2.txt | ](/en-US/docs/Web/HTTP/Headers/Content-Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Secu... | |
Mmdn_HTTP/HTTP_headers_4_8.txt | acks, by
ensuring that their content is not embedded into other sites.
The added security is provided only if the user accessing the document is
using a browser that supports ` X-Frame-Options ` .
**Warning:** The [ ` Content-Security-Policy ` ](/en-
US/docs/Web/HTTP/Headers/Content-Security-Policy) HTTP header has a... | |
Mmdn_HTTP/HTTP_response_status_30_2.txt | nt-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/H... | |
Mmdn_HTTP/Permissions_Policy_directives_17_9.txt | tionâs ](https://www.mozilla.org) not-for-profit
parent, the [ Mozilla Foundation ](https://foundation.mozilla.org/) .
Portions of this content are ©1998â 2024 by individual mozilla.org
contributors. Content available under [ a Creative Commons license ](/en-
US/docs/MDN/Writing_guidelines/Attrib_copyright_l... | |
Mmdn_HTTP/HTTP_response_status_28_7.txt | 10. [ Permissions-Policy: encrypted-media ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media) Experimental
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-not-rendered) Experimental
12. [ Permissions-Policy: execution-w... | |
Mmdn_HTTP/HTTP_response_status_20_7.txt | s/Permissions-Policy/encrypted-media) Experimental
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-not-rendered) Experimental
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/exe... | |
Mmdn_HTTP/CSP_directives_5_3.txt | imental
84. [ ` Save-Data ` ](/en-US/docs/Web/HTTP/Headers/Save-Data) Experimental
85. [ ` Sec-Browsing-Topics ` ](/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics) Experimental Non-standard
86. [ ` Sec-CH-Prefers-Color-Scheme ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme) Experimental
... | |
Mmdn_HTTP/HTTP_request_methods_7_2.txt | ](/en-US/docs/Web/HTTP/Headers/Content-Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Secur... | |
Mmdn_HTTP/HTTP_headers_28_3.txt | d-Motion) Experimental
88. [ ` Sec-CH-Prefers-Reduced-Transparency ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency) Experimental
89. [ ` Sec-CH-UA ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-UA) Experimental
90. [ ` Sec-CH-UA-Arch ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Arch) Experime... | |
Mmdn_HTTP/Permissions_Policy_directives_15_2.txt | 35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie)
38. [ ` Critical-CH ` ](/en-US/docs/Web/HTTP/Headers/Critical-CH) ... | |
Mmdn_HTTP/HTTP_headers_16_7.txt | tal
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-not-rendered) Experimental
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-out-of-viewport) Experimental
... | |
Mmdn_HTTP/HTTP_response_status_10_2.txt | Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/... | |
Mmdn_HTTP/HTTP_headers_22_7.txt | -Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-out-of-viewport) Experimental
13. [ Permissions-Policy: fullscreen ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen)
14. [ Permissions-Policy: gamepad ](/en-US/docs/Web/HTTP/Headers/Permission... | |
Mmdn_HTTP/Header_Field_Definitions_19_0.txt | ### 14.13 Content-Length
The Content-Length entity-header field indicates the size of the entity-body,
in decimal number of OCTETs, sent to the recipient or, in the case of the HEAD
method, the size of the entity-body that would have been sent had the request
been a GET.
Content-Length = "Co... | |
Mmdn_HTTP/HTTP_response_status_15_4.txt | Deprecated
130. [ ` WWW-Authenticate ` ](/en-US/docs/Web/HTTP/Headers/WWW-Authenticate)
131. [ ` X-Content-Type-Options ` ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
132. [ ` X-DNS-Prefetch-Control ` ](/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control) Non-standard
133. [ ` X-Forwarded-F... | |
Mmdn_HTTP/HTTP_response_status_24_2.txt | en-US/docs/Web/HTTP/Headers/Content-Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security... | |
Mmdn_HTTP/Header_Field_Definitions_15_0.txt | ### 14.9.6 Cache Control Extensions
The Cache-Control header field can be extended through the use of one or more
cache-extension tokens, each with an optional assigned value. Informational
extensions (those which do not require a change in cache behavior) MAY be
added without changing the semantics of other directi... | |
Mmdn_HTTP/HTTP_response_status_49_4.txt | n-US/docs/Web/HTTP/Headers/X-Forwarded-For) Non-standard
134. [ ` X-Forwarded-Host ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host) Non-standard
135. [ ` X-Forwarded-Proto ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto) Non-standard
136. [ ` X-Frame-Options ` ](/en-US/docs/Web/HTTP/Headers/X-Frame-... | |
Mmdn_HTTP/HTTP_headers_10_8.txt | en-US/docs/Web/HTTP/Methods/GET) and
[ ` HEAD ` ](/en-US/docs/Web/HTTP/Methods/HEAD) methods, then the server must
return HTTP status code 304 (Not Modified). For methods that apply server-side
changes, the status code 412 (Precondition Failed) is used. Note that the
server generating a 304 response MUST generate any o... | |
Mmdn_HTTP/HTTP_request_methods_1_2.txt | nt-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-... | |
Mmdn_HTTP/HTTP_headers_19_3.txt | rimental
87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion) Experimental
88. [ ` Sec-CH-Prefers-Reduced-Transparency ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency) Experimental
89. [ ` Sec-CH-UA ` ](/en-US/docs/Web/HTTP/Headers/Sec... | |
Mmdn_HTTP/Permissions_Policy_directives_31_1.txt | port Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
4. [ X-Frame-Options ](/en-US/docs/Web/HTTP/Headers/X-Frame-Options)
5. [ X-XSS-Protection ](/en-US/docs/Web/HTTP/Headers/X-XSS-Protection)
6.... | |
Mmdn_HTTP/HTTP_headers_1_5.txt | atus/414)
37. [ ` 415 Unsupported Media Type ` ](/en-US/docs/Web/HTTP/Status/415)
38. [ ` 416 Range Not Satisfiable ` ](/en-US/docs/Web/HTTP/Status/416)
39. [ ` 417 Expectation Failed ` ](/en-US/docs/Web/HTTP/Status/417)
40. [ ` 418 I'm a teapot ` ](/en-US/docs/Web/HTTP/Status/418)
41. [ ` 421 Misdi... | |
Mmdn_HTTP/CSP_directives_5_9.txt | [ Website Privacy Notice ](https://www.mozilla.org/privacy/websites/)
* [ Cookies ](https://www.mozilla.org/privacy/websites/#cookies)
* [ Legal ](https://www.mozilla.org/about/legal/terms/mozilla)
* [ Community Participation Guidelines ](https://www.mozilla.org/about/governance/policies/participation/)
Visit ... | |
Mmdn_HTTP/CSP_directives_16_1.txt | 1.x ](/en-US/docs/Web/HTTP/Connection_management_in_HTTP_1.x)
7. [ Protocol upgrade mechanism ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict... | |
Mmdn_HTTP/Header_Field_Definitions_43_0.txt | ### 14.35.1 Byte Ranges
Since all HTTP entities are represented in HTTP messages as sequences of
bytes, the concept of a byte range is meaningful for any HTTP entity.
(However, not all clients and servers need to support byte- range operations.)
Byte range specifications in HTTP apply to the sequence of bytes in th... | |
Mmdn_HTTP/CSP_directives_0_2.txt | ders/Content-Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ]... | |
Mmdn_HTTP/HTTP_response_status_40_3.txt | ](/en-US/docs/Web/HTTP/Headers/RTT) Experimental
84. [ ` Save-Data ` ](/en-US/docs/Web/HTTP/Headers/Save-Data) Experimental
85. [ ` Sec-Browsing-Topics ` ](/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics) Experimental Non-standard
86. [ ` Sec-CH-Prefers-Color-Scheme ` ](/en-US/docs/Web/HTTP/Headers/Se... | |
Mmdn_HTTP/HTTP_headers_17_1.txt | ty (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
4. [ X-Frame-Options ](/en-US/docs/Web/HTTP/Headers/X-Frame-Options)
5. [ X-XSS-Protection ](/en-US/docs/Web/HTTP/Headers/X-XSS-Protection)
6. [ Mozilla ... | |
Mmdn_HTTP/HTTP_response_status_31_1.txt | docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)... | |
Mmdn_HTTP/HTTP_request_methods_2_9.txt | dard. Check cross-browser support before using.
*[
Deprecated
]: Deprecated. Not for use in new websites.
*[
Experimental
]: Experimental. Expect behavior to change in the future.
| |
Mmdn_HTTP/HTTP_response_status_41_5.txt |
41. [ ` 421 Misdirected Request ` ](/en-US/docs/Web/HTTP/Status/421)
42. [ ` 422 Unprocessable Content ` ](/en-US/docs/Web/HTTP/Status/422)
43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/doc... | |
Mmdn_HTTP/Permissions_Policy_directives_31_6.txt | cript-src-elem)
26. [ ` CSP: style-src ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src)
27. [ ` CSP: style-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-attr)
28. [ ` CSP: style-src-elem ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem)... | |
Mmdn_HTTP/Permissions_Policy_directives_5_2.txt | 35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie)
38. [ ` Critical-CH ` ](/en-US/docs/Web/HTTP/Headers/Critical-CH) ... | |
Mmdn_HTTP/CSP_directives_11_7.txt | -domain ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/document-domain) Experimental
10. [ Permissions-Policy: encrypted-media ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media) Experimental
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Po... | |
Mmdn_HTTP/Permissions_Policy_directives_15_7.txt | al
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-out-of-viewport) Experimental
13. [ Permissions-Policy: fullscreen ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen)
14. [ Permissions-Policy: gamepad ](/en-US/docs/We... | |
Mmdn_HTTP/HTTP_response_status_8_1.txt | in_HTTP_1.x)
7. [ Protocol upgrade mechanism ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Opti... | |
Mmdn_HTTP/Permissions_Policy_directives_11_1.txt | X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
4. [ X-Frame-Options ](/en-US/docs/Web/HTTP/Headers/X-Frame-Options)
5. [ X-XSS-Protection ](/en-US/docs/Web/HTTP/Headers/X-XSS-Protection)
6. [ Mozilla web security guidelines ](https://wiki.mozilla.org/Security/Guidelines/Web_Se... | |
Mmdn_HTTP/HTTP_headers_15_9.txt | ecb11a2a%0A*+Document+last+modified%3A+2024-04-26T17%3A21%3A55.000Z%0A%0A%3C%2Fdetails%3E
"This will take you to GitHub to file a new issue.")
[ MDN logo ](/)
Your blueprint for a better internet.
* [ MDN on Mastodon ](https://mozilla.social/@mdn)
* [ MDN on X (formerly Twitter) ](https://twitter.com/mozdevne... | |
Mmdn_HTTP/HTTP_response_status_22_6.txt | curity-Policy/style-src)
27. [ ` CSP: style-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-attr)
28. [ ` CSP: style-src-elem ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem)
29. [ ` CSP: trusted-types ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Poli... | |
Mmdn_HTTP/Permissions_Policy_directives_18_8.txt | or ` .
## Syntax
http
Permissions-Policy: payment=<allowlist>;
` <allowlist> `
A list of origins for which permission is granted to use the feature. See [ `
Permissions-Policy ` > Syntax ](/en-US/docs/Web/HTTP/Headers/Permissions-
Policy#syntax) for more details.
## Default policy
The ... | |
Mmdn_HTTP/Permissions_Policy_directives_14_1.txt | ade mechanism ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/... | |
Mmdn_HTTP/HTTP_headers_21_8.txt | ster@example.org
## Specifications
Specification
---
[ HTTP Semantics
# field.from ](https://www.rfc-editor.org/rfc/rfc9110#field.from)
## Browser compatibility
BCD tables only load in the browser with JavaScript enabled. Enable
JavaScript to view data.
## See also
* [ ` Host ` ](/en-US/doc... | |
Mmdn_HTTP/CSP_directives_30_5.txt | ](/en-US/docs/Web/HTTP/Status/418)
41. [ ` 421 Misdirected Request ` ](/en-US/docs/Web/HTTP/Status/421)
42. [ ` 422 Unprocessable Content ` ](/en-US/docs/Web/HTTP/Status/422)
43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/424)
4... | |
Mmdn_HTTP/HTTP_response_status_16_1.txt | onnection_management_in_HTTP_1.x)
7. [ Protocol upgrade mechanism ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. ... | |
Mmdn_HTTP/HTTP_headers_22_9.txt | (/en-US/advertising)
## Support
* [ Product help ](https://support.mozilla.org/products/mdn-plus)
* [ Report an issue ](/en-US/docs/MDN/Community/Issues)
## Our communities
* [ MDN Community ](/en-US/community)
* [ MDN Forum ](https://discourse.mozilla.org/c/mdn/236)
* [ MDN Chat ](/discord)
## Develo... | |
Mmdn_HTTP/Permissions_Policy_directives_3_3.txt | eaders/Sec-CH-Prefers-Color-Scheme) Experimental
87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion) Experimental
88. [ ` Sec-CH-Prefers-Reduced-Transparency ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency) Experimental
89. [ ` Sec-CH... | |
Mmdn_HTTP/HTTP_headers_15_2.txt | nt-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie)
38. [ ` Critical-CH ` ](/en-US/docs/Web/HTTP/Headers/Critical-CH) Experimental
... | |
Mmdn_HTTP/CSP_directives_18_9.txt | twitter.com/mozdevnet)
* [ MDN on GitHub ](https://github.com/mdn/)
* [ MDN Blog RSS Feed ](/en-US/blog/rss.xml)
## MDN
* [ About ](/en-US/about)
* [ Blog ](/en-US/blog/)
* [ Careers ](https://www.mozilla.org/en-US/careers/listings/?team=ProdOps)
* [ Advertise with us ](/en-US/advertising)
## Support... | |
Mmdn_HTTP/CSP_directives_21_3.txt | s/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme) Experimental
87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion) Experimental
88. [ ` Sec-CH-Prefers-Reduced-Transparency ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency) Experimental
89... | |
Mmdn_HTTP/HTTP_headers_18_1.txt | -XSS-Protection ](/en-US/docs/Web/HTTP/Headers/X-XSS-Protection)
6. [ Mozilla web security guidelines ](https://wiki.mozilla.org/Security/Guidelines/Web_Security)
7. [ Mozilla Observatory ](https://observatory.mozilla.org/)
6. [ HTTP access control (CORS) ](/en-US/docs/Web/HTTP/CORS)
7. [ HTTP authenticatio... | |
Mmdn_HTTP/CSP_directives_26_8.txt | e> <source>;
### Sources
` <source> ` can be any one of the values listed in [ CSP Source Values ](/en-
US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources#sources) .
Note that this same set of values can be used in all [ fetch directives ](/en-
US/docs/Glossary/Fetch_directive) (and a [ number of other d... | |
Mmdn_HTTP/HTTP_headers_14_8.txt | s/Web/HTTP/Status/200) status code. Ignoring the ` Range ` header is
equivalent to ` Accept-Ranges: none ` , so the [ ` Accept-Ranges ` ](/en-
US/docs/Web/HTTP/Headers/Accept-Ranges) response header is rarely used for
this purpose.
Currently only [ ` bytes ` units are registered
](https://www.iana.org/assignments/http... | |
Mmdn_HTTP/HTTP_headers_4_1.txt | ssion)
6. [ Connection management in HTTP/1.x ](/en-US/docs/Web/HTTP/Connection_management_in_HTTP_1.x)
7. [ Protocol upgrade mechanism ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Securit... | |
Mmdn_HTTP/CSP_directives_17_7.txt | execution-while-not-rendered) Experimental
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-out-of-viewport) Experimental
13. [ Permissions-Policy: fullscreen ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen)
14. [ Perm... | |
Mmdn_HTTP/HTTP_response_status_53_4.txt | Width ` ](/en-US/docs/Web/HTTP/Headers/Width) Non-standard Deprecated
130. [ ` WWW-Authenticate ` ](/en-US/docs/Web/HTTP/Headers/WWW-Authenticate)
131. [ ` X-Content-Type-Options ` ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
132. [ ` X-DNS-Prefetch-Control ` ](/en-US/docs/Web/HTTP/Headers/X-DN... | |
Mmdn_HTTP/HTTP_request_methods_7_7.txt | domain) Experimental
10. [ Permissions-Policy: encrypted-media ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media) Experimental
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-not-rendered) Experimental
12. [ Permissi... | |
Mmdn_HTTP/Permissions_Policy_directives_9_4.txt | US/docs/Web/HTTP/Headers/X-Content-Type-Options)
132. [ ` X-DNS-Prefetch-Control ` ](/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control) Non-standard
133. [ ` X-Forwarded-For ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-For) Non-standard
134. [ ` X-Forwarded-Host ` ](/en-US/docs/Web/HTTP/Headers/X-Forwar... | |
Mmdn_HTTP/HTTP_response_status_48_6.txt | 4. [ ` CSP: script-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr)
25. [ ` CSP: script-src-elem ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem)
26. [ ` CSP: style-src ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src)
27. [ ` CSP:... | |
Mmdn_HTTP/Permissions_Policy_directives_19_8.txt | ace devices such as alternative
keyboards or gamepads.
Specifically, where a defined policy blocks WebHID usage, the [ `
Navigator.hid ` ](/en-US/docs/Web/API/Navigator/hid) property will not be
available.
## Syntax
http
Permissions-Policy: hid=<allowlist>;
` <allowlist> `
A list of orig... | |
Mmdn_HTTP/HTTP_headers_15_4.txt | Web/HTTP/Headers/X-DNS-Prefetch-Control) Non-standard
133. [ ` X-Forwarded-For ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-For) Non-standard
134. [ ` X-Forwarded-Host ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host) Non-standard
135. [ ` X-Forwarded-Proto ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-P... | |
Mmdn_HTTP/HTTP_headers_29_5.txt | docs/Web/HTTP/Status/417)
40. [ ` 418 I'm a teapot ` ](/en-US/docs/Web/HTTP/Status/418)
41. [ ` 421 Misdirected Request ` ](/en-US/docs/Web/HTTP/Status/421)
42. [ ` 422 Unprocessable Content ` ](/en-US/docs/Web/HTTP/Status/422)
43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Fail... | |
Mmdn_HTTP/Header_Field_Definitions_26_0.txt | ### 14.19 ETag
The ETag response-header field provides the current value of the entity tag
for the requested variant. The headers used with entity tags are described in
sections [ 14.24 ](rfc2616-sec14.html#sec14.24) , [ 14.26
](rfc2616-sec14.html#sec14.26) and [ 14.44 ](rfc2616-sec14.html#sec14.44) .
The entity tag... | |
Mmdn_HTTP/HTTP_response_status_33_8.txt | surfing.
**Note:** some servers merely shut down the connection without sending this
message.
## Status
http
408 Request Timeout
## Specifications
Specification
---
[ HTTP Semantics
# status.408 ](https://httpwg.org/specs/rfc9110.html#status.408)
## See also
* [ ` Connection... | |
Mmdn_HTTP/HTTP_response_status_22_5.txt | en-US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/docs/Web/HTTP/Status/425)
46. [ ` 426 Upgrade Required ` ](/en-US/docs/Web/HTTP/Status/426)
47. [ ` 428 Precondition Required ` ](/en-US/docs/Web/HTTP/Status/428)
48. [ ` 429 Too Many Requests ` ](/en-US/docs/Web/HTTP/Status/429)
49. [... | |
Mmdn_HTTP/HTTP_response_status_3_5.txt | )
41. [ ` 421 Misdirected Request ` ](/en-US/docs/Web/HTTP/Status/421)
42. [ ` 422 Unprocessable Content ` ](/en-US/docs/Web/HTTP/Status/422)
43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/do... | |
Mmdn_HTTP/Permissions_Policy_directives_28_8.txt | /Global_Objects/Promise) returned by the `
get() ` call will reject with a ` NotAllowedError ` [ ` DOMException ` ](/en-
US/docs/Web/API/DOMException) .
## Syntax
http
Permissions-Policy: identity-credentials-get=<allowlist>;
` <allowlist> `
A list of origins for which permission is grant... | |
Mmdn_HTTP/HTTP_response_status_4_3.txt | aders/RTT) Experimental
84. [ ` Save-Data ` ](/en-US/docs/Web/HTTP/Headers/Save-Data) Experimental
85. [ ` Sec-Browsing-Topics ` ](/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics) Experimental Non-standard
86. [ ` Sec-CH-Prefers-Color-Scheme ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme)... | |
Mmdn_HTTP/CSP_directives_30_7.txt | crypted-media ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media) Experimental
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-not-rendered) Experimental
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/d... | |
Mmdn_HTTP/HTTP_response_status_10_3.txt | mental
84. [ ` Save-Data ` ](/en-US/docs/Web/HTTP/Headers/Save-Data) Experimental
85. [ ` Sec-Browsing-Topics ` ](/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics) Experimental Non-standard
86. [ ` Sec-CH-Prefers-Color-Scheme ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme) Experimental
... | |
Mmdn_HTTP/Permissions_Policy_directives_11_5.txt | -US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/docs/Web/HTTP/Status/425)
46. [ ` 426 Upgrade Required ` ](/en-US/docs/Web/HTTP/Status/426)
47. [ ` 428 Precondition Required ` ](/en-US/docs/Web/HTTP/Status/428)
48. [ ` 429 Too Many Requests ` ](/en-US/docs/Web/HTTP/Status/429)
49. [ `... | |
Mmdn_HTTP/HTTP_response_status_27_4.txt | dard Deprecated
130. [ ` WWW-Authenticate ` ](/en-US/docs/Web/HTTP/Headers/WWW-Authenticate)
131. [ ` X-Content-Type-Options ` ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
132. [ ` X-DNS-Prefetch-Control ` ](/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control) Non-standard
133. [ ` X-Forwar... | |
Mmdn_HTTP/Permissions_Policy_directives_31_7.txt | licy/execution-while-not-rendered) Experimental _
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-out-of-viewport) Experimental
13. [ Permissions-Policy: fullscreen ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen)
14.... | |
Mmdn_HTTP/HTTP_response_status_60_1.txt | sm ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-T... | |
Mmdn_HTTP/Permissions_Policy_directives_21_5.txt | 43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/docs/Web/HTTP/Status/425)
46. [ ` 426 Upgrade Required ` ](/en-US/docs/Web/HTTP/Status/426)
47. [ ` 428 Precondition Required ` ](/en-US/docs/Web... | |
Mmdn_HTTP/List_of_HTTP_header_fields_6_4.txt | orwarded_ header. | ` X-Forwarded-For: client1, proxy1, proxy2 ` ` X-Forwarded-For: 129.78.138.66, 129.78.64.103 `
X-Forwarded-Host [29] | A [ _de facto_ standard ](/wiki/De_facto_standard "De facto standard") for identifying the original host requested by the client in the ` Host ` HTTP request header, since th... | |
Mmdn_HTTP/CSP_directives_2_3.txt | TP/Headers/RTT) Experimental
84. [ ` Save-Data ` ](/en-US/docs/Web/HTTP/Headers/Save-Data) Experimental
85. [ ` Sec-Browsing-Topics ` ](/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics) Experimental Non-standard
86. [ ` Sec-CH-Prefers-Color-Scheme ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Sc... | |
Mmdn_HTTP/CSP_directives_18_1.txt | ol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
4. [ X-Frame-Op... | |
Mmdn_HTTP/HTTP_response_status_32_7.txt | /docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media) Experimental
11. [ Permissions-Policy: execution-while-not-rendered ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/execution-while-not-rendered) Experimental
12. [ Permissions-Policy: execution-while-out-of-viewport ](/en-US/docs/Web/HTTP/Headers/P... | |
Mmdn_HTTP/HTTP_headers_31_4.txt | Web/HTTP/Headers/Warning) Deprecated
129. [ ` Width ` ](/en-US/docs/Web/HTTP/Headers/Width) Non-standard Deprecated
130. [ ` WWW-Authenticate ` ](/en-US/docs/Web/HTTP/Headers/WWW-Authenticate)
131. [ ` X-Content-Type-Options ` ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
132. [ ` X-DNS-Pref... | |
Mmdn_HTTP/HTTP_response_status_11_1.txt | en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Content-Type-Options ](/en-US/docs/Web/HTTP/Headers/X-Content-Type-Op... | |
Mmdn_HTTP/HTTP_headers_27_3.txt |
88. [ ` Sec-CH-Prefers-Reduced-Transparency ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency) Experimental
89. [ ` Sec-CH-UA ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-UA) Experimental
90. [ ` Sec-CH-UA-Arch ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Arch) Experimental
91. [ ` Sec-C... | |
Mmdn_HTTP/HTTP_response_status_57_5.txt | Web/HTTP/Status/421)
42. [ ` 422 Unprocessable Content ` ](/en-US/docs/Web/HTTP/Status/422)
43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/docs/Web/HTTP/Status/425)
46. _[ ` 426 Upgrade Requi... | |
Mmdn_HTTP/CSP_directives_15_8.txt | eb/HTTP/Headers/Content-
Security-Policy/script-src) , or just for ` <script> ` elements using [ `
script-src-elem ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-
Policy/script-src-elem) .)
CSP version | 3
---|---
Directive type | [ Fetch directive ](/en-US/docs/Glossary/Fetch_directive)
[ ` default-src ... | |
Mmdn_HTTP/HTTP_response_status_51_5.txt | 41. [ ` 421 Misdirected Request ` ](/en-US/docs/Web/HTTP/Status/421)
42. [ ` 422 Unprocessable Content ` ](/en-US/docs/Web/HTTP/Status/422)
43. [ ` 423 Locked ` ](/en-US/docs/Web/HTTP/Status/423)
44. [ ` 424 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/424)
45. [ ` 425 Too Early ` ](/en-US/docs/... | |
Mmdn_HTTP/HTTP_response_status_55_9.txt | elines/Attrib_copyright_license) .
*[
Non-standard
]: Non-standard. Check cross-browser support before using.
*[
Deprecated
]: Deprecated. Not for use in new websites.
*[
... | |
Mmdn_HTTP/HTTP_response_status_36_2.txt | ers/Content-Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](... | |
Mmdn_HTTP/List_of_HTTP_header_fields_7_3.txt | DNT(do-not-track), possible values:
"!" — under construction
"?" — dynamic
"G" — gateway to multiple parties
"N" — not tracking
"T" — tracking
"C" — tracking with consent
"P" — tracking only if consented
"D" — disregarding DNT
"U" — updated
| ` Tk: ? ` | Permanent ... | |
Mmdn_HTTP/HTTP_response_status_42_2.txt | aders/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie)
38. [ ` Critical-CH ` ](/en-US/docs... | |
Mmdn_HTTP/Header_Field_Definitions_17_0.txt | ### 14.11 Content-Encoding
The Content-Encoding entity-header field is used as a modifier to the media-
type. When present, its value indicates what additional content codings have
been applied to the entity-body, and thus what decoding mechanisms must be
applied in order to obtain the media-type referenced by the C... | |
Mmdn_HTTP/HTTP_headers_24_0.txt | * Skip to main content
* Skip to search
* Skip to select language
[ MDN Web Docs ](/en-US/) Open main menu
* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_HTTP/Permissions_Policy_directives_0_0.txt | * Skip to main content
* Skip to search
* Skip to select language
[ MDN Web Docs ](/en-US/) Open main menu
* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_HTTP/HTTP_response_status_28_6.txt | tent-Security-Policy/script-src)
24. [ ` CSP: script-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr)
25. [ ` CSP: script-src-elem ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem)
26. [ ` CSP: style-src ` ](/en-US/docs/Web/HTTP/Headers/Content-Secur... | |
Mmdn_HTTP/HTTP_response_status_26_2.txt | ers/Content-Length)
32. [ ` Content-Location ` ](/en-US/docs/Web/HTTP/Headers/Content-Location)
33. [ ` Content-Range ` ](/en-US/docs/Web/HTTP/Headers/Content-Range)
34. [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](... | |
Mmdn_HTTP/HTTP_request_methods_5_1.txt | on_management_in_HTTP_1.x)
7. [ Protocol upgrade mechanism ](/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism)
5. HTTP security
1. [ Content Security Policy (CSP) ](/en-US/docs/Web/HTTP/CSP)
2. [ HTTP Strict Transport Security (HSTS) ](/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
3. [ X-Con... | |
Mmdn_HTTP/HTTP_headers_0_3.txt | c-Browsing-Topics) Experimental Non-standard
86. [ ` Sec-CH-Prefers-Color-Scheme ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme) Experimental
87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion) Experimental
88. [ ` Sec-CH-Prefers-Reduced-Tr... | |
Mmdn_HTTP/HTTP_response_status_40_8.txt |
## Custom error pages
You can display a custom 404 page to be more helpful to a user and provide
guidance on what to do next. For example, for the Apache server, you can
specify a path to a custom 404 page in an ` .htaccess ` file:
apacheconf
ErrorDocument 404 /notfound.html
For an exampl... | |
Mmdn_HTTP/Permissions_Policy_directives_3_2.txt | Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie)
38. [ ` Critical-CH ` ](/en-US/docs/Web/HTTP/Headers/Critical-CH) Experimental... | |
Mmdn_HTTP/HTTP_response_status_24_6.txt | Web/HTTP/Headers/Content-Security-Policy/script-src)
24. [ ` CSP: script-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr)
25. [ ` CSP: script-src-elem ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem)
26. [ ` CSP: style-src ` ](/en-US/docs/Web/HTTP/H... | |
Mmdn_HTTP/Permissions_Policy_directives_29_2.txt | ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
35. [ ` Content-Security-Policy-Report-Only ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
36. [ ` Content-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie)
38. [ ` C... |
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