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Accept-Ranges header - HTTP | MDN
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Accept-Ranges header

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since July 2015.

The HTTP Accept-Ranges response header is used by the server to advertise its support for range requests, allowing clients to request part or several parts of a resource. The value of this header indicates the unit that can be used to define a range.

For example, a response with an Accept-Ranges header indicates that the server is capable of resuming an interrupted download instead of a client restarting the transfer in full.

Header type Response header

In this article

Syntax

http
Accept-Ranges: <range-unit>
Accept-Ranges: none

Directives

<range-unit>

The range unit that the server supports, although bytes is the only range unit formally defined by RFC 7233. Range units are registered in the HTTP Range Unit Registry.

none

No range unit is supported. This is equivalent to omitting the header and is, therefore, rarely used. This value was used in legacy browsers to disable or remove the pause buttons in the download manager if servers had no support for range requests.

Examples

http
Accept-Ranges: bytes

Specifications

Specification
HTTP Semantics
# field.accept-ranges

Browser compatibility

See also

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  1. HTTP
  2. Guides
  3. Overview of HTTP
  4. Evolution of HTTP
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  6. HTTP messages
  7. Media types
    1. Common types
  8. Compression in HTTP
  9. HTTP caching
  10. HTTP authentication
  11. Using HTTP cookies
  12. Redirections in HTTP
  13. Conditional requests
  14. Range requests
  15. Client hints
  16. User-Agent reduction
  17. Compression Dictionary Transport
  18. Network Error Logging
  19. Content negotiation
    1. Default Accept values
  20. Browser detection using the UA string
  21. Connection management in HTTP/1.x
  22. Protocol upgrade mechanism
  23. Proxy servers and tunneling
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  24. Security and privacy
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    3. Permissions Policy
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    7. Cross-Origin Resource Sharing (CORS)
    8. CORS errors
      1. Reason: CORS disabled
      2. Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'
      3. Reason: CORS header 'Access-Control-Allow-Origin' missing
      4. Reason: CORS header 'Origin' cannot be added
      5. Reason: CORS preflight channel did not succeed
      6. Reason: CORS request did not succeed
      7. Reason: CORS request external redirect not allowed
      8. Reason: CORS request not HTTP
      9. Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'
      10. Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'
      11. Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'
      12. Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'
      13. Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'
      14. Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel
      15. Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed
    9. Content Security Policy (CSP)
      1. Errors and warnings
  25. Reference
  26. HTTP headers
    1. Accept
    2. Accept-CH
    3. Accept-Encoding
    4. Accept-Language
    5. Accept-Patch
    6. Accept-Post
    7. Accept-Ranges
    8. Access-Control-Allow-Credentials
    9. Access-Control-Allow-Headers
    10. Access-Control-Allow-Methods
    11. Access-Control-Allow-Origin
    12. Access-Control-Expose-Headers
    13. Access-Control-Max-Age
    14. Access-Control-Request-Headers
    15. Access-Control-Request-Method
    16. Activate-Storage-Access
    17. Age
    18. Allow
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    20. Alt-Used
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    22. Attribution-Reporting-Register-Source
    23. Attribution-Reporting-Register-Trigger
    24. Authorization
    25. Available-Dictionary
    26. Cache-Control
    27. Clear-Site-Data
    28. Connection
    29. Content-Digest
    30. Content-Disposition
    31. Content-DPR
    32. Content-Encoding
    33. Content-Language
    34. Content-Length
    35. Content-Location
    36. Content-Range
    37. Content-Security-Policy
    38. Content-Security-Policy-Report-Only
    39. Content-Type
    40. Cookie
    41. Critical-CH
    42. Cross-Origin-Embedder-Policy
    43. Cross-Origin-Embedder-Policy-Report-Only
    44. Cross-Origin-Opener-Policy
    45. Cross-Origin-Resource-Policy
    46. Date
    47. Device-Memory
    48. Dictionary-ID
    49. DNT
    50. Downlink
    51. DPR
    52. Early-Data
    53. ECT
    54. ETag
    55. Expect
    56. Expect-CT
    57. Expires
    58. Forwarded
    59. From
    60. Host
    61. Idempotency-Key
    62. If-Match
    63. If-Modified-Since
    64. If-None-Match
    65. If-Range
    66. If-Unmodified-Since
    67. Integrity-Policy
    68. Integrity-Policy-Report-Only
    69. Keep-Alive
    70. Last-Modified
    71. Link
    72. Location
    73. Max-Forwards
    74. NEL
    75. No-Vary-Search
    76. Observe-Browsing-Topics
    77. Origin
    78. Origin-Agent-Cluster
    79. Permissions-Policy
    80. Permissions-Policy-Report-Only
    81. Pragma
    82. Prefer
    83. Preference-Applied
    84. Priority
    85. Proxy-Authenticate
    86. Proxy-Authorization
    87. Range
    88. Referer
    89. Referrer-Policy
    90. Refresh
    91. Report-To
    92. Reporting-Endpoints
    93. Repr-Digest
    94. Retry-After
    95. RTT
    96. Save-Data
    97. Sec-Browsing-Topics
    98. Sec-CH-Device-Memory
    99. Sec-CH-DPR
    100. Sec-CH-Prefers-Color-Scheme
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    103. Sec-CH-UA
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    107. Sec-CH-UA-Full-Version
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    109. Sec-CH-UA-Mobile
    110. Sec-CH-UA-Model
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    113. Sec-CH-UA-WoW64
    114. Sec-CH-Viewport-Height
    115. Sec-CH-Viewport-Width
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    156. Viewport-Width
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  27. HTTP request methods
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    3. GET
    4. HEAD
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    6. PATCH
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    8. PUT
    9. TRACE
  28. HTTP response status codes
    1. 100 Continue
    2. 101 Switching Protocols
    3. 102 Processing
    4. 103 Early Hints
    5. 200 OK
    6. 201 Created
    7. 202 Accepted
    8. 203 Non-Authoritative Information
    9. 204 No Content
    10. 205 Reset Content
    11. 206 Partial Content
    12. 207 Multi-Status
    13. 208 Already Reported
    14. 226 IM Used
    15. 300 Multiple Choices
    16. 301 Moved Permanently
    17. 302 Found
    18. 303 See Other
    19. 304 Not Modified
    20. 307 Temporary Redirect
    21. 308 Permanent Redirect
    22. 400 Bad Request
    23. 401 Unauthorized
    24. 402 Payment Required
    25. 403 Forbidden
    26. 404 Not Found
    27. 405 Method Not Allowed
    28. 406 Not Acceptable
    29. 407 Proxy Authentication Required
    30. 408 Request Timeout
    31. 409 Conflict
    32. 410 Gone
    33. 411 Length Required
    34. 412 Precondition Failed
    35. 413 Content Too Large
    36. 414 URI Too Long
    37. 415 Unsupported Media Type
    38. 416 Range Not Satisfiable
    39. 417 Expectation Failed
    40. 418 I'm a teapot
    41. 421 Misdirected Request
    42. 422 Unprocessable Content
    43. 423 Locked
    44. 424 Failed Dependency
    45. 425 Too Early
    46. 426 Upgrade Required
    47. 428 Precondition Required
    48. 429 Too Many Requests
    49. 431 Request Header Fields Too Large
    50. 451 Unavailable For Legal Reasons
    51. 500 Internal Server Error
    52. 501 Not Implemented
    53. 502 Bad Gateway
    54. 503 Service Unavailable
    55. 504 Gateway Timeout
    56. 505 HTTP Version Not Supported
    57. 506 Variant Also Negotiates
    58. 507 Insufficient Storage
    59. 508 Loop Detected
    60. 510 Not Extended
    61. 511 Network Authentication Required
  29. CSP directives
    1. base-uri
    2. block-all-mixed-content
    3. child-src
    4. connect-src
    5. default-src
    6. fenced-frame-src
    7. font-src
    8. form-action
    9. frame-ancestors
    10. frame-src
    11. img-src
    12. manifest-src
    13. media-src
    14. object-src
    15. prefetch-src
    16. report-to
    17. report-uri
    18. require-trusted-types-for
    19. sandbox
    20. script-src
    21. script-src-attr
    22. script-src-elem
    23. style-src
    24. style-src-attr
    25. style-src-elem
    26. trusted-types
    27. upgrade-insecure-requests
    28. worker-src
  30. Permissions-Policy directives
    1. accelerometer
    2. ambient-light-sensor
    3. aria-notify
    4. attribution-reporting
    5. autoplay
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    10. ch-ua-high-entropy-values
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    17. fullscreen
    18. gamepad
    19. geolocation
    20. gyroscope
    21. hid
    22. identity-credentials-get
    23. idle-detection
    24. language-detector
    25. language-model
    26. local-fonts
    27. local-network
    28. local-network-access
    29. loopback-network
    30. magnetometer
    31. microphone
    32. midi
    33. on-device-speech-recognition
    34. otp-credentials
    35. payment
    36. picture-in-picture
    37. private-state-token-issuance
    38. private-state-token-redemption
    39. publickey-credentials-create
    40. publickey-credentials-get
    41. screen-wake-lock
    42. serial
    43. speaker-selection
    44. storage-access
    45. summarizer
    46. translator
    47. usb
    48. web-share
    49. window-management
    50. xr-spatial-tracking
  31. HTTP resources and specifications
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