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Fix WebSocket connection failure on libcurl 8.12.x by forcing HTTP/1.1 and disabling ALPN/NPN

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Newer libcurl releases (8.12.x and above) default to HTTP/2 via ALPN,
causing the WebSocket RFC6455 handshake to fail with "code:3, message: Bad request".
This change forces HTTP/1.1 and disables ALPN/NPN on WebSocket connections,
restoring correct 101 Switching Protocols behaviour.
This commit is contained in:
abraunegg 2025-10-17 20:38:31 +11:00
commit ce854079e6
1 changed files with 19 additions and 0 deletions
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19
src/curlWebsockets.d
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@ -55,6 +55,20 @@ private:
enum int CURLOPT_TIMEOUT_MS = 155;
enum int CURLOPT_CONNECTTIMEOUT_MS = 156;
enum int CURLOPT_VERBOSE = 41;
// Additional constants needed for WebSocket handling
enum int CURLOPT_HTTP_VERSION = 84; // CURLOPT_HTTP_VERSION
enum int CURLOPT_SSL_ENABLE_ALPN = 226; // CURLOPT_SSL_ENABLE_ALPN
enum int CURLOPT_SSL_ENABLE_NPN = 225; // CURLOPT_SSL_ENABLE_NPN
// HTTP version flags (for CURLOPT_HTTP_VERSION)
enum long CURL_HTTP_VERSION_NONE = 0;
enum long CURL_HTTP_VERSION_1_0 = 1;
enum long CURL_HTTP_VERSION_1_1 = 2;
enum long CURL_HTTP_VERSION_2_0 = 3;
enum long CURL_HTTP_VERSION_2TLS = 4;
enum long CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE = 5;
enum long CURL_HTTP_VERSION_3 = 30; // (added in curl 7.66.0+)
CURL* curl = null;
bool websocketConnected = false;
@ -139,6 +153,11 @@ public:
curl_easy_setopt(curl, cast(int)CURLOPT_CONNECT_ONLY, 1L);
curl_easy_setopt(curl, cast(int)CURLOPT_URL, connectUrl.toStringz); // NUL-terminated
// Force HTTP/1.1 and disable ALPN/NPN
curl_easy_setopt(curl, cast(int)CURLOPT_SSL_ENABLE_ALPN, 0L);
curl_easy_setopt(curl, cast(int)CURLOPT_SSL_ENABLE_NPN, 0L);
curl_easy_setopt(curl, cast(int)CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
// Do we enable HTTPS Debugging?
if (httpsDebug) {
// Enable curl verbosity