http: Remove timeout to exit event loop

Let HTTP connections to timeout due to inactivity.
Let all remaning connections finish sending the response and close.

src/httpserver.cpp

@@ -22,7 +22,6 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <signal.h>
-#include <future>
 
 #include <event2/thread.h>
 #include <event2/buffer.h>
@@ -422,17 +421,14 @@ bool UpdateHTTPServerLogging(bool enable) {
 }
 
 std::thread threadHTTP;
-std::future<bool> threadResult;
 static std::vector<std::thread> g_thread_http_workers;
 
 void StartHTTPServer()
 {
     LogPrint(BCLog::HTTP, "Starting HTTP server\n");
     int rpcThreads = std::max((long)gArgs.GetArg("-rpcthreads", DEFAULT_HTTP_THREADS), 1L);
     LogPrintf("HTTP: starting %d worker threads\n", rpcThreads);
-    std::packaged_task<bool(event_base*)> task(ThreadHTTP);
-    threadResult = task.get_future();
-    threadHTTP = std::thread(std::move(task), eventBase);
+    threadHTTP = std::thread(ThreadHTTP, eventBase);
 
     for (int i = 0; i < rpcThreads; i++) {
         g_thread_http_workers.emplace_back(HTTPWorkQueueRun, workQueue);
@@ -470,16 +466,6 @@ void StopHTTPServer()
     boundSockets.clear();
     if (eventBase) {
         LogPrint(BCLog::HTTP, "Waiting for HTTP event thread to exit\n");
-        // Give event loop a few seconds to exit (to send back last RPC responses), then break it
-        // Before this was solved with event_base_loopexit, but that didn't work as expected in
-        // at least libevent 2.0.21 and always introduced a delay. In libevent
-        // master that appears to be solved, so in the future that solution
-        // could be used again (if desirable).
-        // (see discussion in https://github.com/bitcoin/bitcoin/pull/6990)
-        if (threadResult.valid() && threadResult.wait_for(std::chrono::milliseconds(2000)) == std::future_status::timeout) {
-            LogPrintf("HTTP event loop did not exit within allotted time, sending loopbreak\n");
-            event_base_loopbreak(eventBase);
-        }
         threadHTTP.join();
     }
     if (eventHTTP) {