headers api: remove EXPERIMENTAL tag

Closes #8900

docs/CURL-DISABLE.md

@@ -37,6 +37,10 @@ about existing options to `curl_easy_setopt`.
 
 Disable the GOPHER protocol.
 
+## CURL_DISABLE_HEADERS_API
+
+Disable the HTTP header API.
+
 ## CURL_DISABLE_HSTS
 
 Disable the HTTP Strict Transport Security support.

docs/EXPERIMENTAL.md

@@ -21,4 +21,3 @@ Experimental support in curl means:
  - The Hyper HTTP backend
  - HTTP/3 support and options
  - `CURLSSLOPT_NATIVE_CA` (No configure option, feature built in when supported)
- - The headers API: `curl_easy_header` and `curl_easy_nextheader`.

docs/cmdline-opts/write-out.d

@@ -22,11 +22,10 @@ output a newline by using \\n, a carriage return with \\r and a tab space with
 The output will be written to standard output, but this can be switched to
 standard error by using %{stderr}.
 
-EXPERIMENTAL feature: Output HTTP headers from the most recent request by
-using \fB%header{name}\fP where \fBname\fP is the case insensitive name of the
-header (without the trailing colon). The header contents are exactly as sent
-over the network, with leading and trailing whitespace trimmed. Added in curl
-7.83.0.
+Output HTTP headers from the most recent request by using \fB%header{name}\fP
+where \fBname\fP is the case insensitive name of the header (without the
+trailing colon). The header contents are exactly as sent over the network,
+with leading and trailing whitespace trimmed. Added in curl 7.84.0.
 
 .B NOTE:
 The %-symbol is a special symbol in the win32-environment, where all
@@ -55,8 +54,6 @@ The initial path curl ended up in when logging on to the remote FTP
 server. (Added in 7.15.4)
 .TP
 .B header_json
-EXPERIMENTAL feature.
-
 A JSON object with all HTTP response headers from the recent transfer. Values
 are provided as arrays, since in the case of multiple headers there can be
 multiple values.

docs/libcurl/curl_easy_header.3

@@ -33,8 +33,6 @@ CURLHcode curl_easy_header(CURL *easy,
                            int request,
                            struct curl_header **hout);
 .SH DESCRIPTION
-EXPERIMENTAL feature!
-
 \fIcurl_easy_header(3)\fP returns a pointer to a "curl_header" struct in
 \fBhout\fP with data for the HTTP response header \fIname\fP. The case
 insensitive nul-terminated header name should be specified without colon.
@@ -131,7 +129,7 @@ CURLHcode h =
   curl_easy_header(easy, "Content-Type", 0, CURLH_HEADER, -1, &type);
 .fi
 .SH AVAILABILITY
-Added in 7.83.0
+Added in 7.83.0. Officially supported since 7.84.0.
 .SH RETURN VALUE
 This function returns a CURLHcode indicating success or error.
 .IP "CURLHE_BADINDEX (1)"

docs/libcurl/curl_easy_nextheader.3

@@ -32,8 +32,6 @@ struct curl_header *curl_easy_nextheader(CURL *easy,
                                          struct curl_header *prev);
 .fi
 .SH DESCRIPTION
-EXPERIMENTAL feature!
-
 This function lets an application iterate over all previously received HTTP
 headers.
 
@@ -85,7 +83,7 @@ while((h = curl_easy_nextheader(easy, origin, -1, prev))) {
 }
 .fi
 .SH AVAILABILITY
-Added in 7.83.0
+Added in 7.83.0. Officially supported since 7.84.0.
 .SH RETURN VALUE
 This function returns the next header, or NULL when there are no more
 (matching) headers or an error occurred.