alt-svc: enable by default

Remove CURLALTSVC_IMMEDIATELY, which was never implemented/supported.

alt-svc support in curl is no longer considered experimental

Closes #5868

lib/altsvc.c

@@ -25,7 +25,7 @@
  */
 #include "curl_setup.h"
 
-#if !defined(CURL_DISABLE_HTTP) && defined(USE_ALTSVC)
+#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_ALTSVC)
 #include <curl/curl.h>
 #include "urldata.h"
 #include "altsvc.h"
@@ -457,6 +457,9 @@ CURLcode Curl_altsvc_parse(struct Curl_easy *data,
   struct altsvc *as;
   unsigned short dstport = srcport; /* the same by default */
   CURLcode result = getalnum(&p, alpnbuf, sizeof(alpnbuf));
+#ifdef CURL_DISABLE_VERBOSE_STRINGS
+  (void)data;
+#endif
   if(result) {
     infof(data, "Excessive alt-svc header, ignoring...\n");
     return CURLE_OK;
@@ -642,4 +645,4 @@ bool Curl_altsvc_lookup(struct altsvcinfo *asi,
   return FALSE;
 }
 
-#endif /* CURL_DISABLE_HTTP || USE_ALTSVC */
+#endif /* !CURL_DISABLE_HTTP && !CURL_DISABLE_ALTSVC */

lib/altsvc.h

@@ -23,7 +23,7 @@
  ***************************************************************************/
 #include "curl_setup.h"
 
-#if !defined(CURL_DISABLE_HTTP) && defined(USE_ALTSVC)
+#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_ALTSVC)
 #include <curl/curl.h>
 #include "llist.h"
 
@@ -75,5 +75,5 @@ bool Curl_altsvc_lookup(struct altsvcinfo *asi,
 /* disabled */
 #define Curl_altsvc_save(a,b,c)
 #define Curl_altsvc_cleanup(x)
-#endif /* CURL_DISABLE_HTTP || USE_ALTSVC */
+#endif /* !CURL_DISABLE_HTTP && !CURL_DISABLE_ALTSVC */
 #endif /* HEADER_CURL_ALTSVC_H */

lib/config-os400.h

@@ -422,9 +422,6 @@
 /* Define if you can safely include both <sys/time.h> and <time.h>. */
 #define TIME_WITH_SYS_TIME
 
-/* Define to enable alt-svc support (experimental) */
-#undef USE_ALTSVC
-
 /* Define to enable HTTP3 support (experimental, requires NGTCP2 or QUICHE) */
 #undef ENABLE_QUIC
 

lib/curl_config.h.cmake

@@ -1017,8 +1017,8 @@ ${SIZEOF_TIME_T_CODE}
 /* if Unix domain sockets are enabled  */
 #cmakedefine USE_UNIX_SOCKETS
 
-/* to enable alt-svc */
-#cmakedefine USE_ALTSVC 1
+/* to disable alt-svc */
+#cmakedefine CURL_DISABLE_ALTSVC 1
 
 /* Define to 1 if you are building a Windows target with large file support. */
 #cmakedefine USE_WIN32_LARGE_FILES 1

lib/curl_get_line.c

@@ -22,7 +22,7 @@
 
 #include "curl_setup.h"
 
-#if !defined(CURL_DISABLE_COOKIES) && !defined(CURL_DISABLE_ALTSVC)
+#if !defined(CURL_DISABLE_COOKIES) || !defined(CURL_DISABLE_ALTSVC)
 
 #include "curl_get_line.h"
 #include "curl_memory.h"

lib/http.c

@@ -2518,7 +2518,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
   if(result)
     return result;
 
-#ifdef USE_ALTSVC
+#ifndef CURL_DISABLE_ALTSVC
   if(conn->bits.altused && !Curl_checkheaders(conn, "Alt-Used")) {
     altused = aprintf("Alt-Used: %s:%d\r\n",
                       conn->conn_to_host.name, conn->conn_to_port);
@@ -3992,7 +3992,7 @@ CURLcode Curl_http_readwrite_headers(struct Curl_easy *data,
         }
       }
     }
-#ifdef USE_ALTSVC
+#ifndef CURL_DISABLE_ALTSVC
     /* If enabled, the header is incoming and this is over HTTPS */
     else if(data->asi && checkprefix("Alt-Svc:", headp) &&
             ((conn->handler->flags & PROTOPT_SSL) ||

lib/rename.c

@@ -24,8 +24,8 @@
 
 #include "curl_setup.h"
 
-#if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)) ||  \
-  defined(USE_ALTSVC)
+#if (!defined(CURL_DISABLE_HTTP) || !defined(CURL_DISABLE_COOKIES)) || \
+  !defined(CURL_DISABLE_ALTSVC)
 
 #include "curl_multibyte.h"
 #include "timeval.h"

lib/setopt.c

@@ -2839,7 +2839,7 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
     data->set.trailer_data = va_arg(param, void *);
 #endif
     break;
-#ifdef USE_ALTSVC
+#ifndef CURL_DISABLE_ALTSVC
   case CURLOPT_ALTSVC:
     if(!data->asi) {
       data->asi = Curl_altsvc_init();

lib/url.c

@@ -3095,7 +3095,7 @@ static CURLcode parse_connect_to_slist(struct Curl_easy *data,
     conn_to_host = conn_to_host->next;
   }
 
-#ifdef USE_ALTSVC
+#ifndef CURL_DISABLE_ALTSVC
   if(data->asi && !host && (port == -1) &&
      ((conn->handler->protocol == CURLPROTO_HTTPS) ||
 #ifdef CURLDEBUG

lib/urldata.h

@@ -1899,7 +1899,7 @@ struct Curl_easy {
                                   NOTE that the 'cookie' field in the
                                   UserDefined struct defines if the "engine"
                                   is to be used or not. */
-#ifdef USE_ALTSVC
+#ifndef CURL_DISABLE_ALTSVC
   struct altsvcinfo *asi;      /* the alt-svc cache */
 #endif
   struct Progress progress;    /* for all the progress meter data */

lib/version.c

@@ -415,7 +415,7 @@ static curl_version_info_data version_info = {
 #if defined(HAVE_ZSTD)
   | CURL_VERSION_ZSTD
 #endif
-#if defined(USE_ALTSVC)
+#ifndef CURL_DISABLE_ALTSVC
   | CURL_VERSION_ALTSVC
 #endif
   ,