id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_HTTP/HTTP_headers_26_8.txt | edia/content type is specified in the [ ` Content-Type
` ](/en-US/docs/Web/HTTP/Headers/Content-Type) header, and that the ` Content-
Encoding ` applies to the representation, or "coded form", of the data. If the
original media is encoded in some way (e.g. a zip file) then this information
would not be included in the ... | |
Mmdn_HTTP/HTTP_headers_24_7.txt | erimental
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) Experimental
15. [ Permissions-Policy: geolocation ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/geo... | |
Mmdn_HTTP/HTTP_request_methods_4_8.txt | .com
### Responses
If a ` DELETE ` method is successfully applied, there are several response
status codes possible:
* A [ ` 202 ` ](/en-US/docs/Web/HTTP/Status/202) ( ` Accepted ` ) status code if the action will likely succeed but has not yet been enacted.
* A [ ` 204 ` ](/en-US/docs/Web/HTTP/Status/204... | |
Mmdn_HTTP/HTTP_response_status_3_1.txt | n-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-Opt... | |
Mmdn_HTTP/Permissions_Policy_directives_34_5.txt | 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/Web/HT... | |
Mmdn_HTTP/HTTP_headers_13_4.txt | ` ](/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-DNS-Prefe... | |
Mmdn_HTTP/HTTP_headers_4_4.txt | ing ` ](/en-US/docs/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)
... | |
Mmdn_HTTP/Permissions_Policy_directives_3_8.txt | US/docs/Web/API/Idle_Detection_API "Idle Detection API") to detect when users
are interacting with their devices, for example to report "available"/"away"
status in chat applications.
Specifically, where a defined policy blocks use of this feature, [ `
IdleDetector.start() ` ](/en-US/docs/Web/API/IdleDetector/start) c... | |
Mmdn_HTTP/List_of_HTTP_header_fields_0_0.txt | Jump to content
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Mmdn_HTTP/HTTP_response_status_38_8.txt | 202 Accepted
## Specifications
Specification
---
[ HTTP Semantics
# status.202 ](https://httpwg.org/specs/rfc9110.html#status.202)
## See also
* [ ` Accept ` ](/en-US/docs/Web/HTTP/Headers/Accept)
## Help improve MDN
Was this page helpful to you?
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Mmdn_HTTP/HTTP_response_status_9_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/... | |
Mmdn_HTTP/HTTP_response_status_49_0.txt | * Skip to main content
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* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_HTTP/HTTP_response_status_41_4.txt | [ ` 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/docs/Web... | |
Mmdn_HTTP/Permissions_Policy_directives_22_7.txt | [ 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/Web/HTTP/Heade... | |
Mmdn_HTTP/HTTP_response_status_21_1.txt | ) ](/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 web secu... | |
Mmdn_HTTP/CSP_directives_19_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/HTTP_response_status_55_7.txt | -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/docs/Web... | |
Mmdn_HTTP/HTTP_headers_33_7.txt | -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) Experimental ... | |
Mmdn_HTTP/CSP_directives_27_3.txt | ` Retry-After ` ](/en-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... | |
Mmdn_HTTP/HTTP_request_methods_0_8.txt | | May
[ Safe ](/en-US/docs/Glossary/Safe/HTTP) | No
[ Idempotent ](/en-US/docs/Glossary/Idempotent) | Yes
[ Cacheable ](/en-US/docs/Glossary/Cacheable) | No
Allowed in [ HTML forms ](/en-US/docs/Learn/Forms) | No
## Syntax
http
PUT /new.html HTTP/1.1
## Example
### Reque... | |
Mmdn_HTTP/HTTP_headers_0_8.txt | http
// Single directive
Clear-Site-Data: "cache"
// Multiple directives (comma separated)
Clear-Site-Data: "cache", "cookies"
// Wild card
Clear-Site-Data: "*"
## Directives
**Note:** All directives must comply with the [ quoted-string grammar
](https://datatracker.... | |
Mmdn_HTTP/HTTP_response_status_34_0.txt | * Skip to main content
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* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_HTTP/HTTP_request_methods_4_2.txt | 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/HTTP/Headers/Content-Security-Policy)
... | |
Mmdn_HTTP/HTTP_response_status_0_1.txt | y)
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 web security guidelines ](https://wiki.mozilla.org/Security/Guide... | |
Mmdn_HTTP/HTTP_response_status_39_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_19_5.txt | ocs/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. [ ` 431 ... | |
Mmdn_HTTP/HTTP_response_status_18_4.txt | NS-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. [ ` X-Forwarded-Proto ` ](/en-US... | |
Mmdn_HTTP/CSP_directives_18_3.txt | erimental
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/Web/HTTP/Headers/Sec-... | |
Mmdn_HTTP/Permissions_Policy_directives_3_9.txt | acy/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 [ Mozilla Corporationâs ](https://www.mozilla.org) not... | |
Mmdn_HTTP/HTTP_headers_37_8.txt | should be persisted for all
secure requests to ensure client hints are sent reliably.
## Syntax
http
Accept-CH: <comma separated list of client hint headers>
## Examples
http
Accept-CH: Viewport-Width, Width
Vary: Viewport-Width, Width
**Note:** Remember to [ vary the... | |
Mmdn_HTTP/HTTP_response_status_59_2.txt | t-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/Headers/Content-Type)
37. [ ` Cookie ` ](/en-... | |
Mmdn_HTTP/CSP_directives_20_9.txt | CONTRIBUTING.md "This will take you
to our contribution guidelines on GitHub.") .
This page was last modified on Apr 10, 2023 by [ MDN contributors ](/en-
US/docs/Web/HTTP/Headers/Content-Security-Policy/default-src/contributors.txt)
.
[ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-... | |
Mmdn_HTTP/CSP_directives_6_9.txt | %2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2F369b8ec2c87b6c5b01d1527fddb6810ded3be782%0A*+Document+last+modified%3A+2023-12-16T06%3A56%3A50.000Z%0A%0A%3C%2Fdetails%3E
"This will take you to GitHub to file a new issue.")
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Mmdn_HTTP/Permissions_Policy_directives_18_0.txt | * Skip to main content
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Mmdn_HTTP/HTTP_response_status_43_2.txt | /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-Poli... | |
Mmdn_HTTP/HTTP_response_status_45_7.txt | ment-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. [ Per... | |
Mmdn_HTTP/Permissions_Policy_directives_5_4.txt | ](/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. [ ` X-Forwarded-Proto ` ](/en-US/docs/Web/HTTP/Headers... | |
Mmdn_HTTP/HTTP_response_status_8_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_request_methods_2_1.txt | 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-Options ](/en-US/doc... | |
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Mmdn_HTTP/HTTP_response_status_20_8.txt | response is sent back.
## Status
http
412 Precondition Failed
## Examples
http
ETag: "33a64df551425fcc55e4d42a148795d9f25f89d4"
ETag: W/"0815"
### Avoiding mid-air collisions
With the help of the ` ETag ` and the [ ` If-Match ` ](/en-
US/docs/Web/HTTP/Headers/If-Matc... | |
Mmdn_HTTP/CSP_directives_13_2.txt | 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 ` ](/en-... | |
Mmdn_HTTP/HTTP_headers_31_0.txt | * Skip to main content
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Mmdn_HTTP/Permissions_Policy_directives_34_7.txt | ermissions-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/... | |
Mmdn_HTTP/Permissions_Policy_directives_6_1.txt | y)
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 web security guidelines ](https://wiki.mozilla.org/Security/Guide... | |
Mmdn_HTTP/Permissions_Policy_directives_25_2.txt | 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/Headers/Content-Type)
37. [ ` C... | |
Mmdn_HTTP/HTTP_response_status_2_9.txt | ookies ](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 [ Mozilla Corporationâs ](https://www.mozilla.org) not-for-profit
parent, th... | |
Mmdn_HTTP/HTTP_response_status_24_7.txt | ain) 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. [ Permissions... | |
Mmdn_HTTP/CSP_directives_2_6.txt | rs/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/Headers/Content... | |
Mmdn_HTTP/Header_Field_Definitions_0_0.txt | part of [ Hypertext Transfer Protocol -- HTTP/1.1 ](rfc2616.html)
RFC 2616 Fielding, et al.
## 14 Header Field Definitions
This section defines the syntax and semantics of all standard HTTP/1.1 header
fields. For entity-header fields, both sender and recipient refer to either
the client or the server, depending o... | |
Mmdn_HTTP/HTTP_headers_32_9.txt | /Web/HTTP/Headers/Content-Digest) , [ ` Want-Content-Digest ` ](/en-US/docs/Web/HTTP/Headers/Want-Content-Digest) , [ ` Want-Repr-Digest ` ](/en-US/docs/Web/HTTP/Headers/Want-Repr-Digest)
* [ ` ETag ` ](/en-US/docs/Web/HTTP/Headers/ETag)
* [ ` Content-Encoding ` ](/en-US/docs/Web/HTTP/Headers/Content-Encoding)
## ... | |
Mmdn_HTTP/HTTP_headers_34_2.txt | /Content-Encoding)
30. [ ` Content-Language ` ](/en-US/docs/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/Conten... | |
Mmdn_HTTP/CSP_directives_19_2.txt | ders/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)
36. [ `... | |
Mmdn_HTTP/HTTP_headers_9_3.txt | ` 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/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-M... | |
Mmdn_HTTP/Permissions_Policy_directives_25_9.txt | ontent available under [ a Creative Commons license ](/en-
US/docs/MDN/Writing_guidelines/Attrib_copyright_license) .
*[
Non-standard
]: Non-standard. Check cross-browser support before using.
*[
Deprecated
... | |
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Mmdn_HTTP/CSP_directives_29_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/exec... | |
Mmdn_HTTP/Permissions_Policy_directives_17_0.txt | * Skip to main content
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Mmdn_HTTP/CSP_directives_22_7.txt | 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-viewport) E... | |
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Mmdn_HTTP/HTTP_response_status_37_2.txt | ocation ` ](/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-Secu... | |
Mmdn_HTTP/HTTP_headers_23_3.txt | s/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-CH-UA) Experimental
90. [ ` Sec-CH-UA-Arch ` ](/en-US/docs/Web/HTTP/Headers/S... | |
Mmdn_HTTP/HTTP_response_status_19_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_29_1.txt | 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/HTTP/Headers/X-Frame-Options)
5. [ X-XSS-Protection ](/en-US/docs/Web/HTTP/Headers/X-XSS-Prote... | |
Mmdn_HTTP/HTTP_headers_33_5.txt | /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. [ ` 431 Request... | |
Mmdn_HTTP/CSP_directives_16_9.txt | s%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-
us%2Fweb%2Fhttp%2Fheaders%2Fcontent-security-policy%2Fscript-src-
elem%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2F0880a90f3811475d78bc4b2c344eb4146f25f66c%0A*+Document+last+modified%3A+2023-04-10T19%3A47%3A15.000Z%0A... | |
Mmdn_HTTP/CSP_directives_6_8.txt | and
* [ ` Navigator.sendBeacon() ` ](/en-US/docs/Web/API/Navigator/sendBeacon) .
**Note:** ` connect-src 'self' ` does not resolve to websocket schemes in all
browsers, more info in this [ issue ](https://github.com/w3c/webappsec-
csp/issues/7) .
CSP version | 1
---|---
Directive type | [ Fetch directiv... | |
Mmdn_HTTP/HTTP_headers_28_7.txt | tal
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) Experimental
15. [ Permissions-Policy: geolocation ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/geolocati... | |
Mmdn_HTTP/CSP_directives_24_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/HTTP_request_methods_0_6.txt | /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/Headers/C... | |
Mmdn_HTTP/Permissions_Policy_directives_30_1.txt | . [ 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/HTTP/Headers/X-Frame-Op... | |
Mmdn_HTTP/HTTP_response_status_44_8.txt | TTP/Methods/GET) or [ ` HEAD ` ](/en-
US/docs/Web/HTTP/Methods/HEAD) methods and use the [ ` 308 Permanent Redirect
` ](/en-US/docs/Web/HTTP/Status/308) for [ ` POST ` ](/en-
US/docs/Web/HTTP/Methods/POST) methods instead, as the method change is
explicitly prohibited with this status.
## Status
http
... | |
Mmdn_HTTP/HTTP_response_status_46_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/Sec-... | |
Mmdn_HTTP/HTTP_headers_23_2.txt | nt-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
39. [ ` Cross-Origin-Embedder-Policy ` ](/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy)
40. [ ` Cross... | |
Mmdn_HTTP/HTTP_response_status_47_8.txt | o our contribution guidelines on GitHub.") .
This page was last modified on Apr 10, 2023 by [ MDN contributors ](/en-
US/docs/Web/HTTP/Status/417/contributors.txt) .
[ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-
us/web/http/status/417/index.md?plain=1 "Folder: en-us/web/http/statu... | |
Mmdn_HTTP/HTTP_response_status_15_2.txt | ation ` ](/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-Securi... | |
Mmdn_HTTP/HTTP_headers_35_1.txt | ction_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-... | |
Mmdn_HTTP/Header_Field_Definitions_52_0.txt | ### 14.43 User-Agent
The User-Agent request-header field contains information about the user agent
originating the request. This is for statistical purposes, the tracing of
protocol violations, and automated recognition of user agents for the sake of
tailoring responses to avoid particular user agent limitations. Us... | |
Mmdn_HTTP/Header_Field_Definitions_53_0.txt | ### 14.44 Vary
The Vary field value indicates the set of request-header fields that fully
determines, while the response is fresh, whether a cache is permitted to use
the response to reply to a subsequent request without revalidation. For
uncacheable or stale responses, the Vary field value advises the user agent
ab... | |
Mmdn_HTTP/Header_Field_Definitions_39_0.txt | ### 14.32 Pragma
The Pragma general-header field is used to include implementation- specific
directives that might apply to any recipient along the request/response chain.
All pragma directives specify optional behavior from the viewpoint of the
protocol; however, some systems MAY require that behavior be consistent... | |
Mmdn_HTTP/CSP_directives_16_7.txt | y/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) Experimental
12.... | |
Mmdn_HTTP/HTTP_headers_34_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_60_8.txt | t-Type ` ](/en-US/docs/Web/HTTP/Headers/Content-Type)
* [ ` Content-Encoding ` ](/en-US/docs/Web/HTTP/Headers/Content-Encoding)
* [ ` Accept ` ](/en-US/docs/Web/HTTP/Headers/Accept)
## Help improve MDN
Was this page helpful to you?
Yes No
[ Learn how to contribute
](https://github.com/mdn/content/blob/main/CO... | |
Mmdn_HTTP/HTTP_response_status_10_1.txt | n_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-Optio... | |
Mmdn_HTTP/HTTP_response_status_46_8.txt |
## Specifications
Specification
---
[ HTTP Semantics
# status.403 ](https://www.rfc-editor.org/rfc/rfc9110#status.403)
## Browser compatibility
BCD tables only load in the browser with JavaScript enabled. Enable
JavaScript to view data.
## See also
* [ ` 401 ` ](/en-US/docs/Web/HTTP/Status/... | |
Mmdn_HTTP/Permissions_Policy_directives_35_1.txt | ecurity)
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 web security guidelines ](https://wiki.mozilla.org/Security... | |
Mmdn_HTTP/Header_Field_Definitions_3_0.txt | ### 14.3 Accept-Encoding
The Accept-Encoding request-header field is similar to Accept, but restricts
the content-codings (section 3.5) that are acceptable in the response.
Accept-Encoding = "Accept-Encoding" ":"
1#( codings [ ";" "q" "=" qvalue ] ... | |
Mmdn_HTTP/CSP_directives_21_5.txt | 3)
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)
48. [ ` 429 Too Many Requests ` ](... | |
Mmdn_HTTP/CSP_directives_29_3.txt | ers/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/Web... | |
Mmdn_HTTP/CSP_directives_21_1.txt | 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 web security guidelines ](https:/... | |
Mmdn_HTTP/HTTP_headers_26_2.txt | (/en-US/docs/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 ` ](/e... | |
Mmdn_HTTP/HTTP_response_status_7_5.txt | atus/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 Failed Dependency ` ... | |
Mmdn_HTTP/HTTP_response_status_41_3.txt | P/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/do... | |
Mmdn_HTTP/List_of_HTTP_header_fields_10_3.txt | (/wiki/SAP_SE "SAP SE") . Retrieved January 20, 2015 .
40. ** ^ ** [ "Django Cross Site Request Forgery protection" ](https://web.archive.org/web/20150120134602/https://docs.djangoproject.com/en/1.7/ref/contrib/csrf/) . [ Django (web framework) ](/wiki/Django_\(web_framework\) "Django \(web framework\)") . Archi... | |
Mmdn_HTTP/HTTP_response_status_7_1.txt | P/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/HTTP_headers_11_2.txt | n-US/docs/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-... | |
Mmdn_HTTP/HTTP_headers_18_9.txt | ty/Issues)
## Our communities
* [ MDN Community ](/en-US/community)
* [ MDN Forum ](https://discourse.mozilla.org/c/mdn/236)
* [ MDN Chat ](/discord)
## Developers
* [ Web Technologies ](/en-US/docs/Web)
* [ Learn Web Development ](/en-US/docs/Learn)
* [ MDN Plus ](/en-US/plus)
* [ Hacks Blog ](http... | |
Mmdn_HTTP/HTTP_response_status_38_1.txt | 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-Options ](/en-... | |
Mmdn_HTTP/CSP_directives_2_8.txt | ion directive ](/en-US/docs/Glossary/Navigation_directive)
[ ` default-src ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/default-src) fallback | No. Not setting this allows anything.
## Syntax
One or more sources can be set for the ` form-action ` policy:
http
Content-Security-Pol... | |
Mmdn_HTTP/HTTP_response_status_15_3.txt | ](/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
87. [ ` Sec-CH-Prefers-Reduce... |
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