Are HTTP headers case-sensitive?

Header names are not case sensitive.

From RFC 2616 – “Hypertext Transfer Protocol — HTTP/1.1”, Section 4.2, “Message Headers”:

Each header field consists of a name followed by a colon (“:”) and the field value. Field names are case-insensitive.

The updating RFC 7230 does not list any changes from RFC 2616 at this part.

Related Posts:

  1. Do I need Content-Type: application/octet-stream for file download?
  2. application/x-www-form-urlencoded or multipart/form-data?
  3. application/x-www-form-urlencoded or multipart/form-data?
  4. “CAUTION: provisional headers are shown” in Chrome debugger
  5. What are all the possible values for HTTP “Content-Type” header?
  6. When looking at the differences between X-Auth-Token vs Authorization headers, which is preferred?
  7. Human readable format for http headers with tcpdump
  8. Should a 502 HTTP status code be used if a proxy receives no response at all?
  9. What is the difference between a URI, a URL and a URN?
  10. HTTP Status 504
  11. What is the difference between POST and GET? [duplicate]
  12. Problem HTTP error 403 in Python 3 Web Scraping
  13. Problem HTTP error 403 in Python 3 Web Scraping
  14. Is 418 “I’m a teapot” really an HTTP response code?
  15. How to define the basic HTTP authentication using cURL correctly?
  16. How to define the basic HTTP authentication using cURL correctly?
  17. “Cannot GET /” with Connect on Node.js
  18. Possible reason for NGINX 499 error codes
  19. @ converted to %40 in HTTPPost request
  20. What’s the difference between a POST and a PUT HTTP REQUEST?
  21. What does HTTP/1.1 302 mean exactly?
  22. How do I send a POST request with PHP?
  23. Why is it said that “HTTP is a stateless protocol”?
  24. What’s the difference between using application/csv vs text/csv? [duplicate]
  25. What is the difference between PUT, POST and PATCH?
  26. What’s the difference between “Request Payload” vs “Form Data” as seen in Chrome dev tools Network tab
  27. Exception in thread “main” java.net.NoRouteToHostException: No route to host
  28. ndroid 8: Cleartext HTTP traffic not permitted
  29. WebException (Status: Protocol Error)
  30. Can PHP cURL retrieve response headers AND body in a single request?
  31. Setting Curl’s Timeout in PHP
  32. How are parameters sent in an HTTP POST request?
  33. Why am I suddenly getting a “Blocked loading mixed active content” issue in Firefox?
  34. wget: unable to resolve host address `http’
  35. WordPress HTTP parameter pollution
  36. Does WordPress send data about your blog to WordPress.org or Automattic?
  37. Hiding WordPress REST API v2 endpoints from public viewing
  38. Does WordPress only support HTTP 1.1?
  39. How do I troubleshoot responses with WP HTTP API?
  40. Is curl required?
  41. The resource was preloaded using link preload but not used within a few seconds
  42. using wp_remote_get to retrieve own url on local host
  43. Using wp-cron in backpress – problems with wp_remote_post, fsockopen error
  44. Running index.php from command line & load balancer health checks
  45. Enable CORS in wordpress
  46. Change port of wordpress
  47. How to get value of custom http header?
  48. Several times request to load plugins when sending one request
  49. why is $_REQUESt[‘redirect_to’] empty?
  50. Get “HTTP/1.1 406 Not Acceptable” when accesing my website with Delphi Indy Control
  51. WordPress HTTP 500 Error “page isn’t working”
  52. What’s the point in having “www” in a URL?
  53. For what is the “.well-known”-folder?
  54. How to make wireshark filter POST-requests only?
  55. Image file urls still point to http instead of https
  56. WordPress is removing http:// from my urls
  57. What is the difference between POST and PUT in HTTP?
  58. What is the difference between POST and PUT in HTTP?
  59. SOAP vs REST (differences)
  60. How do I POST JSON data with cURL?
  61. Chrome hangs after certain amount of data transfered – waiting for available socket
  62. Use of PUT vs PATCH methods in REST API real life scenarios
  63. How do I POST JSON data with cURL?
  64. How to redirect all HTTP requests to HTTPS
  65. 403 Forbidden vs 401 Unauthorized HTTP responses
  66. How to send a header using a HTTP request through a cURL call?
  67. Why Puma listen on ‘tcp://localhost:3000’ instead of ‘http://localhost:3000’
  68. How to download a file over HTTP?
  69. What does enctype=’multipart/form-data’ mean?
  70. HTTPS connections over proxy servers
  71. Failed to load PDF document in Chrome
  72. How to download a file over HTTP?
  73. What does enctype=’multipart/form-data’ mean?
  74. What is the correct JSON content type?
  75. Axios Delete request with body and headers?
  76. What is the correct JSON content type?
  77. What is the correct JSON content type?
  78. How to use java.net.URLConnection to fire and handle HTTP requests
  79. How to do a PUT request with cURL?
  80. Error: No default engine was specified and no extension was provided
  81. HTTP GET request in JavaScript?
  82. Significance of port 3000 in Express apps
  83. PHP + curl, HTTP POST sample code?
  84. How do I pull from a Git repository through an HTTP proxy?
  85. Response to preflight request doesn’t pass access control check
  86. Custom Tumblr theme wont save because of non-https urls?
  87. What does vary:accept-encoding mean?
  88. How to prevent Browser cache for php site
  89. What is “X-Content-Type-Options=nosniff”?
  90. What is “X-Content-Type-Options=nosniff”?
  91. Access-Control-Allow-Origin Multiple Origin Domains?
  92. How to handle ETIMEDOUT error?
  93. How is an HTTP POST request made in node.js?
  94. Access Control Request Headers, is added to header in AJAX request with jQuery
  95. Uri not Absolute exception getting while calling Restful Webservice
  96. How to download HTTP directory with all files and sub-directories as they appear on the online files/folders list?
  97. How do I POST JSON data with cURL?
  98. What’s the point of the X-Requested-With header?
  99. Proper MIME media type for PDF files
  100. HTTP GET with request body

Leave a Comment

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)