configure: better --disable-http

- disable HTTPS-proxy as well, since it can't work without HTTP

- curl_setup: when HTTP is disabled, also disable all features that are
  HTTP-only

- version: HTTPS-proxy only exists if HTTP support exists

Closes #12223

3 files changed, 44 insertions, 14 deletions

diff --git a/configure.ac b/configure.ac
index a80748c10..6a8e81564 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4590,20 +4590,31 @@ if test "x$CURL_WITH_MULTI_SSL" = "x1"; then
   SUPPORT_FEATURES="$SUPPORT_FEATURES MultiSSL"
 fi
 
+AC_MSG_CHECKING([if this build supports HTTPS-proxy])
 dnl if not explicitly turned off, HTTPS-proxy comes with some TLS backends
-if test "x$https_proxy" != "xno"; then
-  if test "x$OPENSSL_ENABLED" = "x1" \
-      -o "x$GNUTLS_ENABLED" = "x1" \
-      -o "x$SECURETRANSPORT_ENABLED" = "x1" \
-      -o "x$RUSTLS_ENABLED" = "x1" \
-      -o "x$BEARSSL_ENABLED" = "x1" \
-      -o "x$SCHANNEL_ENABLED" = "x1" \
-      -o "x$GNUTLS_ENABLED" = "x1" \
-      -o "x$MBEDTLS_ENABLED" = "x1"; then
-    SUPPORT_FEATURES="$SUPPORT_FEATURES HTTPS-proxy"
-  elif test "x$WOLFSSL_ENABLED" = "x1" -a "x$WOLFSSL_FULL_BIO" = "x1"; then
-    SUPPORT_FEATURES="$SUPPORT_FEATURES HTTPS-proxy"
+if test "x$CURL_DISABLE_HTTP" != "x1"; then
+  if test "x$https_proxy" != "xno"; then
+    if test "x$OPENSSL_ENABLED" = "x1" \
+        -o "x$GNUTLS_ENABLED" = "x1" \
+        -o "x$SECURETRANSPORT_ENABLED" = "x1" \
+        -o "x$RUSTLS_ENABLED" = "x1" \
+        -o "x$BEARSSL_ENABLED" = "x1" \
+        -o "x$SCHANNEL_ENABLED" = "x1" \
+        -o "x$GNUTLS_ENABLED" = "x1" \
+        -o "x$MBEDTLS_ENABLED" = "x1"; then
+      SUPPORT_FEATURES="$SUPPORT_FEATURES HTTPS-proxy"
+      AC_MSG_RESULT([yes])
+    elif test "x$WOLFSSL_ENABLED" = "x1" -a "x$WOLFSSL_FULL_BIO" = "x1"; then
+      SUPPORT_FEATURES="$SUPPORT_FEATURES HTTPS-proxy"
+      AC_MSG_RESULT([yes])
+    else
+      AC_MSG_RESULT([no])
+    fi
+  else
+    AC_MSG_RESULT([no])
   fi
+else
+  AC_MSG_RESULT([no])
 fi
 
 if test "x$ECH_ENABLED" = "x1"; then
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index fc462280f..de5b8040a 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -219,6 +219,23 @@
 #  define CURL_DISABLE_RTSP
 #endif
 
+/*
+ * When HTTP is disabled, disable HTTP-only features
+ */
+
+#if defined(CURL_DISABLE_HTTP)
+#  define CURL_DISABLE_ALTSVC 1
+#  define CURL_DISABLE_COOKIES 1
+#  define CURL_DISABLE_BASIC_AUTH 1
+#  define CURL_DISABLE_BEARER_AUTH 1
+#  define CURL_DISABLE_AWS 1
+#  define CURL_DISABLE_DOH 1
+#  define CURL_DISABLE_FORM_API 1
+#  define CURL_DISABLE_HEADERS_API 1
+#  define CURL_DISABLE_HSTS 1
+#  define CURL_DISABLE_HTTP_AUTH 1
+#endif
+
 /* ================================================================ */
 /* No system header file shall be included in this file before this */
 /* point.                                                           */
diff --git a/lib/version.c b/lib/version.c
index 47304259e..d1855313c 100644
--- a/lib/version.c
+++ b/lib/version.c
@@ -409,7 +409,8 @@ static int idn_present(curl_version_info_data *info)
 #define idn_present     NULL
 #endif
 
-#if defined(USE_SSL) && !defined(CURL_DISABLE_PROXY)
+#if defined(USE_SSL) && !defined(CURL_DISABLE_PROXY) && \
+  !defined(CURL_DISABLE_HTTP)
 static int https_proxy_present(curl_version_info_data *info)
 {
   (void) info;
@@ -460,7 +461,8 @@ static const struct feat features_table[] = {
 #if defined(ENABLE_QUIC)
   FEATURE("HTTP3",       NULL,                CURL_VERSION_HTTP3),
 #endif
-#if defined(USE_SSL) && !defined(CURL_DISABLE_PROXY)
+#if defined(USE_SSL) && !defined(CURL_DISABLE_PROXY) && \
+  !defined(CURL_DISABLE_HTTP)
   FEATURE("HTTPS-proxy", https_proxy_present, CURL_VERSION_HTTPS_PROXY),
 #endif
 #if defined(USE_LIBIDN2) || defined(USE_WIN32_IDN)