SPDY protocol

- UNOFF

Networking protocol for low-latency transport of content over the web. Superseded by HTTP version 2.

IE

  1. 5.5 - 10
  2. 11

Edge

  1. 12 - 81
  2. 83

Firefox

  1. 2 - 12
  2. 13 - 50
  3. 51 - 75
  4. 76
  5. 77 - 78

Chrome

  1. 4 - 50
  2. 51 - 81
  3. 83
  4. 84 - 86

Safari

  1. 3.1 - 7.1
  2. 8 - 12
  3. 12.1 - 13
  4. 13.1
  5. TP

Opera

  1. 9 - 12
  2. 12.1 - 39
  3. 40 - 41
  4. 42
  5. 43
  6. 44
  7. 45 - 67
  8. 68

iOS Safari

  1. 3.2 - 7.1
  2. 8 - 12.1
  3. 12.2 - 13.3
  4. 13.4

Opera Mini

  1. all

Android Browser

  1. 2.1 - 2.3
  2. 3 - 4.4.4
  3. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 12
  2. 12.1
  3. 46

Chrome for Android

  1. 81

Firefox for Android

  1. 68

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 12.12

Samsung Internet

  1. 4
  2. 5 - 10.1
  3. 11.1

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5

See also support for HTTP2, successor of SPDY.

Chrome will be removing support in 2016 (in favor of HTTP2), other browsers likely to follow.

Resources:
SPDY whitepaper
Wikipedia