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Mmdn_HTTP/HTTP_response_status_38_5.txt
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 Failed Dependency ` ](/en-US/docs/Web/HTTP/Status/4...
Mmdn_HTTP/HTTP_headers_24_3.txt
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-CH-UA) Experimental 90. [ ` Sec-CH-UA-Arch ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Arch) Ex...
Mmdn_HTTP/Permissions_Policy_directives_12_4.txt
` ](/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-For ` ](/en-US/docs/Web/HTTP/Headers/X-Forw...
Mmdn_HTTP/Header_Field_Definitions_23_0.txt
### 14.17 Content-Type The Content-Type entity-header field indicates the media type of the entity- body sent to the recipient or, in the case of the HEAD method, the media type that would have been sent had the request been a GET. Content-Type = "Content-Type" ":" media-type Media typ...
Mmdn_HTTP/HTTP_response_status_8_5.txt
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 Failed Dependency ` ](/en-US/docs/Web/HTT...
Mmdn_HTTP/HTTP_headers_31_3.txt
aders/Retry-After) 83. [ ` RTT ` ](/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...
Mmdn_HTTP/Permissions_Policy_directives_26_7.txt
s-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/Permissio...
Mmdn_HTTP/HTTP_headers_7_9.txt
elines ](https://www.mozilla.org/about/governance/policies/participation/) Visit [ Mozilla Corporation’s ](https://www.mozilla.org) not-for-profit parent, the [ Mozilla Foundation ](https://foundation.mozilla.org/) . Portions of this content are ©1998– 2024 by individual mozilla.org contributors. Content av...
Mmdn_HTTP/HTTP_headers_20_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_27_1.txt
col 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-Options ](/en-US/docs/Web/HTTP/...
Mmdn_HTTP/HTTP_response_status_32_1.txt
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/X-C...
Mmdn_HTTP/CSP_directives_4_2.txt
) 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/Web/HT...
Mmdn_HTTP/HTTP_response_status_43_1.txt
eb/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-Transport-Security...
Mmdn_HTTP/List_of_HTTP_header_fields_1_0.txt
## Contents move to sidebar hide * (Top) * 1 General format * 2 Field names * 3 Field values * 4 Size limits * 5 Request fields Toggle Request fields subsection * 5.1 Standard request fields * 5.2 Common non-standard request fields * 6 Response fields Toggle Response fields s...
Mmdn_HTTP/Permissions_Policy_directives_9_9.txt
wser 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_0_6.txt
rs/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) 29. [ ` CSP: trusted-types ` ](/en-US/docs/Web/HTTP/Headers/Content-...
Mmdn_HTTP/Permissions_Policy_directives_12_6.txt
eaders/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: style-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Conte...
Mmdn_HTTP/HTTP_headers_29_9.txt
ww.mozilla.org/) * [ 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/par...
Mmdn_HTTP/CSP_directives_23_6.txt
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: style-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Secu...
Mmdn_HTTP/Permissions_Policy_directives_10_5.txt
ocs/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 Required ` ](/en-US/docs/Web/HTTP/Status/426) 47. [ ` 428 Precondition Re...
Mmdn_HTTP/HTTP_headers_10_2.txt
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-Security-Policy-Report-...
Mmdn_HTTP/CSP_directives_20_2.txt
cs/Web/HTTP/Headers/Content-Language) 31. [ ` Content-Length ` ](/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/...
Mmdn_HTTP/HTTP_headers_4_2.txt
HTTP/Headers/Content-Language) 31. [ ` Content-Length ` ](/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/HTT...
Mmdn_HTTP/HTTP_request_methods_3_4.txt
/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-Prefetc...
Mmdn_HTTP/CSP_directives_29_1.txt
cs/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/Permissions_Policy_directives_33_7.txt
ution-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 13. [ Permissions-Policy: fullscreen ]...
Mmdn_HTTP/HTTP_response_status_29_3.txt
/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 87. [ ` Sec-CH-Prefers-Reduced-Motion ...
Mmdn_HTTP/Header_Field_Definitions_18_0.txt
### 14.12 Content-Language The Content-Language entity-header field describes the natural language(s) of the intended audience for the enclosed entity. Note that this might not be equivalent to all the languages used within the entity-body. Content-Language = "Content-Language" ":" 1#language-...
Mmdn_HTTP/HTTP_response_status_57_1.txt
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-Options ](/en-US/docs/Web/HT...
Mmdn_HTTP/List_of_HTTP_header_fields_1_2.txt
iki/Computer_data_logging "Computer data logging") by the server and client applications. They define how information sent/received through the connection are encoded (as in [ Content-Encoding ](/wiki/HTTP_compression#Content-Encoding_tokens "HTTP compression") ), the session verification and identification of the clie...
Mmdn_HTTP/CSP_directives_9_1.txt
-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-Opti...
Mmdn_HTTP/CSP_directives_11_8.txt
irective is marked as obsolete in the specification: all mixed content is now blocked if it can't be autoupgraded. The HTTP [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content- Security-Policy) (CSP) **` block-all-mixed-content ` ** directive prevents loading any assets over HTTP when the page uses HT...
Mmdn_HTTP/HTTP_response_status_37_1.txt
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-Options ](/en-US/docs/Web/HTTP/Hea...
Mmdn_HTTP/Permissions_Policy_directives_6_4.txt
-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-Proto) Non-standard...
Mmdn_HTTP/HTTP_headers_5_7.txt
rmissions-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-Policy/execution-while-not-rendered) Experi...
Mmdn_HTTP/CSP_directives_28_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_13_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_37_6.txt
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: style-...
Mmdn_HTTP/CSP_directives_23_7.txt
ypted-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/execution-while-out-of-viewp...
Mmdn_HTTP/HTTP_headers_4_6.txt
ty-Policy/sandbox) 23. [ ` CSP: script-src ` ](/en-US/docs/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-...
Mmdn_HTTP/HTTP_response_status_5_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-...
Mmdn_HTTP/Header_Field_Definitions_48_0.txt
### 14.39 TE The TE request-header field indicates what extension transfer-codings it is willing to accept in the response and whether or not it is willing to accept trailer fields in a chunked transfer-coding. Its value may consist of the keyword "trailers" and/or a comma-separated list of extension transfer-coding...
Mmdn_HTTP/HTTP_headers_5_5.txt
ectation Failed ` ](/en-US/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/Statu...
Mmdn_HTTP/Permissions_Policy_directives_21_4.txt
ent-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-Forwarded-Host) Non-standard 135...
Mmdn_HTTP/Permissions_Policy_directives_12_5.txt
ected 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/Web/HTTP/Status/425) ...
Mmdn_HTTP/HTTP_response_status_46_7.txt
t-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. [ Permis...
Mmdn_HTTP/HTTP_response_status_39_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/List_of_HTTP_header_fields_6_2.txt
eturned if content is unchanged. | ` If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT ` | Permanent | [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110) If-None-Match | Allows a _304 Not Modified_ to be returned if content is unchanged, see [ HTTP ETa...
Mmdn_HTTP/HTTP_response_status_49_8.txt
iated to the delta) HTTP headers. IM stands for _instance manipulations_ the term used to describe an algorithm generating a _delta_ . ## Status 226 IM Used ## Specifications Specification --- [ Unknown specification # section-10.4.1 ](https://www.rfc- editor.org/rfc/rfc3229.html#secti...
Mmdn_HTTP/HTTP_response_status_46_6.txt
docs/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/H...
Mmdn_HTTP/CSP_directives_22_5.txt
](/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/Web/HTTP/Status/425) 46. [ ` 426 ...
Mmdn_HTTP/CSP_directives_17_5.txt
ed ` ](/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/HTTP/Status/428) ...
Mmdn_HTTP/HTTP_request_methods_8_9.txt
T&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en- us%2Fweb%2Fhttp%2Fmethods%2Fpost%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen- US%2Fdocs%2FWeb%2FHTTP%2FMethods%2FPOST%0A*+GitHub+URL%3A+https%3A%2F%2Fgi...
Mmdn_HTTP/Permissions_Policy_directives_1_5.txt
ocessable 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 Required ` ](/en-US/docs/Web/HTTP/Status/426) ...
Mmdn_HTTP/HTTP_response_status_20_6.txt
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: style-src-attr ` ](/en-US/docs/Web/...
Mmdn_HTTP/HTTP_headers_31_7.txt
TTP/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-Policy/execution-while-not-re...
Mmdn_HTTP/HTTP_response_status_30_3.txt
rowsing-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 87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion) E...
Mmdn_HTTP/CSP_directives_18_6.txt
aders/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: style-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Conten...
Mmdn_HTTP/CSP_directives_18_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_headers_20_9.txt
\(Opens in a new tab\)") • [ Report a problem with this content ](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn- url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen- US%2Fdocs%2FWeb%2FHTTP%2FHeaders%2FDPR&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPag...
Mmdn_HTTP/Permissions_Policy_directives_24_5.txt
/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 Required ...
Mmdn_HTTP/Header_Field_Definitions_22_0.txt
### 14.16 Content-Range The Content-Range entity-header is sent with a partial entity-body to specify where in the full entity-body the partial body should be applied. Range units are defined in section [ 3.12 ](rfc2616-sec3.html#sec3.12) . Content-Range = "Content-Range" ":" content-range-spec...
Mmdn_HTTP/HTTP_response_status_51_3.txt
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 87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs...
Mmdn_HTTP/CSP_directives_15_4.txt
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-For ` ](/en-US/do...
Mmdn_HTTP/HTTP_headers_9_6.txt
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: style-src-attr ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style...
Mmdn_HTTP/HTTP_response_status_40_9.txt
d ]: Non-standard. Check cross-browser support before using. *[ Deprecated ]: Deprecated. Not for use in new websites. *[ Experimental ]: Experimental. ...
Mmdn_HTTP/HTTP_headers_0_0.txt
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Mmdn_HTTP/Permissions_Policy_directives_29_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/We...
Mmdn_HTTP/Permissions_Policy_directives_0_3.txt
al 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-Transparency ` ](/en-US/docs/We...
Mmdn_HTTP/HTTP_response_status_22_7.txt
n-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/Permissions-Policy/gamepad)...
Mmdn_HTTP/CSP_directives_3_1.txt
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) 4. [...
Mmdn_HTTP/CSP_directives_15_3.txt
eb/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 87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en...
Mmdn_HTTP/Header_Field_Definitions_25_0.txt
### 14.18.1 Clockless Origin Server Operation Some origin server implementations might not have a clock available. An origin server without a clock MUST NOT assign Expires or Last- Modified values to a response, unless these values were associated with the resource by a system or user with a reliable clock. It MAY a...
Mmdn_HTTP/HTTP_response_status_47_1.txt
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-Options ](/en-US/docs/Web...
Mmdn_HTTP/HTTP_headers_32_2.txt
rs/Content-Type) 37. [ ` Cookie ` ](/en-US/docs/Web/HTTP/Headers/Cookie) 38. [ ` Critical-CH ` ](/en-US/docs/Web/HTTP/Headers/Critical-CH) Experimental 39. [ ` Cross-Origin-Embedder-Policy ` ](/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy) 40. [ ` Cross-Origin-Opener-Policy ` ](/en-US/docs/...
Mmdn_HTTP/HTTP_response_status_5_1.txt
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-Options ](/en-US/docs/Web/HTTP/Head...
Mmdn_HTTP/Header_Field_Definitions_46_0.txt
### 14.37 Retry-After The Retry-After response-header field can be used with a 503 (Service Unavailable) response to indicate how long the service is expected to be unavailable to the requesting client. This field MAY also be used with any 3xx (Redirection) response to indicate the minimum time the user-agent is ask...
Mmdn_HTTP/HTTP_response_status_58_1.txt
nnection_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_4_3.txt
-US/docs/Web/HTTP/Headers/Retry-After) 83. [ ` RTT ` ](/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-...
Mmdn_HTTP/Permissions_Policy_directives_3_5.txt
` 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/HTTP/Status/428) 48. [ ` 429 Too Many Requests ` ](/en-US/docs/...
Mmdn_HTTP/Permissions_Policy_directives_34_4.txt
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-Proto...
Mmdn_HTTP/HTTP_response_status_48_4.txt
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-DNS-Prefetch-Control) Non-standard 133. [ ` X-Fo...
Mmdn_HTTP/HTTP_response_status_31_6.txt
-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: style-src-attr ` ](/en-US/docs/Web...
Mmdn_HTTP/Permissions_Policy_directives_30_0.txt
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Mmdn_HTTP/CSP_directives_7_2.txt
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-Security-Policy-Report-Only)...
Mmdn_HTTP/HTTP_response_status_6_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_response_status_21_3.txt
lor-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-Transparency ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transpare...
Mmdn_HTTP/Permissions_Policy_directives_18_5.txt
TP/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 Required ` ](/en-US/docs/Web/HTTP/Status/426) 47. [ ` 428 Precondition Required ` ]...
Mmdn_HTTP/Permissions_Policy_directives_30_4.txt
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-For ` ](/en-US/docs/Web/HTTP/Headers/X-Forwarded-For) Non-standard 134. [ ` X-Forwarded-H...
Mmdn_HTTP/HTTP_headers_6_7.txt
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/execu...
Mmdn_HTTP/HTTP_headers_8_3.txt
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 87. [ ` Sec-CH-Prefers-Reduced-Motion ` ](/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion) Experimental 88. [ ...
Mmdn_HTTP/HTTP_response_status_52_4.txt
-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-For ` ](/en-US/docs/Web/HTTP/H...
Mmdn_HTTP/CSP_directives_30_6.txt
) 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-Security-Policy/style-src) 27. [...
Mmdn_HTTP/HTTP_response_status_37_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_46_4.txt
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-Prefetch-Control ` ](/en-US/docs/Web/HTTP/...
Mmdn_HTTP/HTTP_headers_31_1.txt
ection 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 Security (HSTS) ](/en-US/do...
Mmdn_HTTP/HTTP_response_status_40_6.txt
S/docs/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...
Mmdn_HTTP/Header_Field_Definitions_24_0.txt
### 14.18 Date The Date general-header field represents the date and time at which the message was originated, having the same semantics as orig-date in RFC 822. The field value is an HTTP-date, as described in section [ 3.3.1 ](rfc2616-sec3.html#sec3.3.1) ; it MUST be sent in RFC 1123 [ [8] ](rfc2616-sec17.html#bib...
Mmdn_HTTP/HTTP_response_status_14_4.txt
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-For ` ](/en-US/...
Mmdn_HTTP/HTTP_response_status_2_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...