tml#limitrequestfieldsize) on May 9, 2012  . Retrieved  March 13,  2012  . 
  11. ^  _**a** _ _**b** _ _**c** _ [ _RFC 3229_ ](https://datatracker.ietf.org/doc/html/rfc3229) . [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC3229 ](https://doi.org/10.17487%2FRFC3229) . 
  12. ^  _**a** _ _**b** _ _**c** _ [ "Cross-Origin Resource Sharing" ](https://www.w3.org/TR/cors/) . Retrieved  July 24,  2017  . 
  13. ^  _**a** _ _**b** _ [ "Connection header" ](https://datatracker.ietf.org/doc/html/rfc9110#section-7.6.1) . [ _HTTP Semantics_ ](https://datatracker.ietf.org/doc/html/rfc9110) . June 2022. sec. 7.6.1. [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC9110 ](https://doi.org/10.17487%2FRFC9110) . [ RFC ](/wiki/Request_for_Comments "Request for Comments") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110) . 
  14. ^  _**a** _ _**b** _ _**c** _ _**d** _ _**e** _ _**f** _ _**g** _ _**h** _ _**i** _ [ "Connection-Specific Header Fields" ](https://datatracker.ietf.org/doc/html/rfc9113#section-8.2.2) . [ _HTTP/2_ ](https://datatracker.ietf.org/doc/html/rfc9113) . June 2022. sec. 8.2.2. [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC9113 ](https://doi.org/10.17487%2FRFC9113) . [ RFC ](/wiki/Request_for_Comments "Request for Comments") [ 9113 ](https://datatracker.ietf.org/doc/html/rfc9113) . 
  15. ^  _**a** _ _**b** _ [ "Changes from RFC 2616" ](https://datatracker.ietf.org/doc/html/rfc7231#appendix-B) . [ _Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content_ ](https://datatracker.ietf.org/doc/html/rfc7231) . June 2014. sec. B. [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC7231 ](https://doi.org/10.17487%2FRFC7231) . [ RFC ](/wiki/Request_for_Comments "Request for Comments") [ 7231 ](https://datatracker.ietf.org/doc/html/rfc7231) . 
  16. ** ^  ** Petersson, A.; Nilsson, M. (June 2014). [ "Forwarded HTTP Extension: Introduction" ](http://tools.ietf.org/html/rfc7239#section-1) . [ IETF ](/wiki/IETF "IETF") . [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") : [ 10.17487/RFC7239 ](https://doi.org/10.17487%2FRFC7239) . Retrieved  January 7,  2016  .  ` {{ [ cite journal ](/wiki/Template:Cite_journal "Template:Cite journal") }} ` :  Cite journal requires ` |journal= ` ( [ help ](/wiki/Help:CS1_errors#missing_periodical "Help:CS1 errors") ) 
  17. ** ^  ** [ "Host and :authority" ](https://datatracker.ietf.org/doc/html/rfc9110#section-7.2) . [ _HTTP Semantics_ ](https://datatracker.ietf.org/doc/html/rfc9110) . June 2022. sec. 7.2. [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC9110 ](https://doi.org/10.17487%2FRFC9110) . [ RFC ](/wiki/Request_for_Comments "Request for Comments") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110) . 
  18. ** ^  ** [ "Request Pseudo-Header Fields" ](https://datatracker.ietf.org/doc/html/rfc9113#section-8.3.1) . [ _HTTP/2_ ](https://datatracker.ietf.org/doc/html/rfc9113) . June 2022. sec. 8.3.1. [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC9113 ](https://doi.org/10.17487%2FRFC9113) . [ RFC ](/wiki/Request_for_Comments "Request for Comments") [ 9113 ](https://datatracker.ietf.org/doc/html/rfc9113) . 
  19. ** ^  ** [ "Message Headers" ](https://www.iana.org/assignments/message-headers/message-headers.xml) . _www.iana.org_ . Retrieved  November 26,  2018  . 
  20. ** ^  ** [ "HTTP2-Settings Header Field" ](https://datatracker.ietf.org/doc/html/rfc7540#section-3.2.1) . [ _Hypertext Transfer Protocol Version 2 (HTTP/2)_ ](https://datatracker.ietf.org/doc/html/rfc7540) . sec. 3.2.1. [ doi ](/wiki/Doi_\(identifier\) "Doi \(identifier\)") :  [ 10.17487/RFC7540 ](https://doi.org/10.17487%2FRFC7540) . [ RFC ](/wiki/Request_for_Comments "Request for Comments") [ 7540 ](https://datatracker.ietf.org/doc/html/rfc7540) . 
  21. ^  _**a** _ _**b** _ [ "Warning header" ](https://datatracker.ietf.org/doc/html/rfc9111#section-5.5) . [ _HTTP Caching_ ](htt