HTTPServer: generate sequential Ids for each newly accepted connection

diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index 0bda2843..0b846523 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -1008,4 +1008,9 @@ std::unique_ptr<Sock> HTTPServer::AcceptConnection(const Sock& listen_sock, CSer
 
     return sock;
 }
+
+HTTPServer::Id HTTPServer::GetNewId()
+{
+    return m_next_id.fetch_add(1, std::memory_order_relaxed);
+}
 } // namespace http_bitcoin
diff --git a/src/httpserver.h b/src/httpserver.h
index e4dabc63..20b9731c 100644
--- a/src/httpserver.h
+++ b/src/httpserver.h
@@ -5,6 +5,7 @@
 #ifndef BITCOIN_HTTPSERVER_H
 #define BITCOIN_HTTPSERVER_H
 
+#include <atomic>
 #include <functional>
 #include <memory>
 #include <optional>
@@ -306,6 +307,11 @@ public:
 class HTTPServer
 {
 public:
+    /**
+     * Each connection is assigned an unique id of this type.
+     */
+    using Id = uint64_t;
+
     /**
      * Bind to a new address:port, start listening and add the listen socket to `m_listen`.
      * @param[in] to Where to bind.
@@ -339,6 +345,11 @@ private:
      */
     std::vector<std::shared_ptr<Sock>> m_listen;
 
+    /**
+     * The id to assign to the next created connection.
+     */
+    std::atomic<Id> m_next_id{0};
+
     /**
      * Accept a connection.
      * @param[in] listen_sock Socket on which to accept the connection.
@@ -346,6 +357,11 @@ private:
      * @return Newly created socket for the accepted connection.
      */
     std::unique_ptr<Sock> AcceptConnection(const Sock& listen_sock, CService& addr);
+
+    /**
+     * Generate an id for a newly created connection.
+     */
+    Id GetNewId();
 };
 } // namespace http_bitcoin