implemented keepalive

http.h

@@ -1,10 +1,26 @@
+
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <openssl/ssl.h>
+// keepalive state
+typedef struct {
+    SOCKET sock;
+    SSL* ssl;
+    SSL_CTX* ctx;
+    char hostname[256];
+    int connected;
+} HTTPConnection;
 void InitSockets();
 int SendShortHTTPReq(const char *hostname, const char *reqtype,
                      const char *endpoint, const char *extra_headers,
                      const char *user_agent, const char *content_type,
                      void *payload, unsigned long payload_size, char** response, long* responselen);
 
-
+HTTPConnection* HTTPConnect(const char* hostname);
+int SendHTTPRequest(HTTPConnection* conn, const char* method, const char* endpoint, const char* extra_headers,
+    const char* user_agent, const char* content_type, void* payload,
+    unsigned long payload_size, char** response, long* responselen);
+int CloseHTTPConnection(HTTPConnection* conn);
 static void AppendHeader(char *buf, const char *key, const char *value);
 
 int InitHTTP();