diff --git a/src/rpc/request.cpp b/src/rpc/request.cpp
index a80ba9e08f..05f41ae17e 100644
--- a/src/rpc/request.cpp
+++ b/src/rpc/request.cpp
@@ -218,18 +218,8 @@ void JSONRPCRequest::parse(const UniValue& valRequest)
     m_json_version = JSONRPCVersion::V1_LEGACY;
     const UniValue& jsonrpc_version = request.find_value("jsonrpc");
     if (!jsonrpc_version.isNull()) {
-        if (!jsonrpc_version.isStr()) {
-            throw JSONRPCError(RPC_INVALID_REQUEST, "jsonrpc field must be a string");
-        }
-        // The "jsonrpc" key was added in the 2.0 spec, but some older documentation
-        // incorrectly included {"jsonrpc":"1.0"} in a request object, so we
-        // maintain that for backwards compatibility.
-        if (jsonrpc_version.get_str() == "1.0") {
-            m_json_version = JSONRPCVersion::V1_LEGACY;
-        } else if (jsonrpc_version.get_str() == "2.0") {
+        if (jsonrpc_version.isStr() && jsonrpc_version.get_str() == "2.0") {
             m_json_version = JSONRPCVersion::V2;
-        } else {
-            throw JSONRPCError(RPC_INVALID_REQUEST, "JSON-RPC version not supported");
         }
     }
 
diff --git a/test/functional/interface_rpc.py b/test/functional/interface_rpc.py
index 9074f0a2d9..0ae85578f3 100755
--- a/test/functional/interface_rpc.py
+++ b/test/functional/interface_rpc.py
@@ -172,10 +172,13 @@ class RPCInterfaceTest(BitcoinTestFramework):
         self.log.info("Testing nonstandard jsonrpc 1.0 version number is accepted...")
         self.test_batch_request(lambda idx: BatchOptions(request_fields={"jsonrpc": "1.0"}))
 
-        self.log.info("Testing unrecognized jsonrpc version number is rejected...")
+        self.log.info("Testing nonstandard jsonrpc 1.0 version number is accepted as a Number...")
+        self.test_batch_request(lambda idx: BatchOptions(request_fields={"jsonrpc": 1.0}))
+
+        self.log.info("Testing unrecognized jsonrpc version number is accepted as if 1.0...")
         self.test_batch_request(lambda idx: BatchOptions(
             request_fields={"jsonrpc": "2.1"},
-            response_fields={"result": None, "error": {"code": RPC_INVALID_REQUEST, "message": "JSON-RPC version not supported"}}))
+            ))
 
     def test_http_status_codes(self):
         self.log.info("Testing HTTP status codes for JSON-RPC 1.1 requests...")
@@ -201,11 +204,11 @@ class RPCInterfaceTest(BitcoinTestFramework):
         expect_http_rpc_status(200, RPC_INVALID_PARAMETER,  self.nodes[0], "getblockhash", [42], 2, False)
         # force-send invalidly formatted requests
         response, status = send_json_rpc(self.nodes[0], {"jsonrpc": 2, "method": "getblockcount"})
-        assert_equal(response, {"result": None, "error": {"code": RPC_INVALID_REQUEST, "message": "jsonrpc field must be a string"}})
-        assert_equal(status, 400)
+        assert_equal(response, {"result": 0, "error": None})
+        assert_equal(status, 200)
         response, status = send_json_rpc(self.nodes[0], {"jsonrpc": "3.0", "method": "getblockcount"})
-        assert_equal(response, {"result": None, "error": {"code": RPC_INVALID_REQUEST, "message": "JSON-RPC version not supported"}})
-        assert_equal(status, 400)
+        assert_equal(response, {"result": 0, "error": None})
+        assert_equal(status, 200)
 
         self.log.info("Testing HTTP status codes for JSON-RPC 2.0 notifications...")
         # Not notification: id exists
diff --git a/test/functional/test_framework/authproxy.py b/test/functional/test_framework/authproxy.py
index a357ae4d34..3adb744b4d 100644
--- a/test/functional/test_framework/authproxy.py
+++ b/test/functional/test_framework/authproxy.py
@@ -192,7 +192,7 @@ class AuthServiceProxy():
         response = json.loads(responsedata, parse_float=decimal.Decimal)
         elapsed = time.time() - req_start_time
         if "error" in response and response["error"] is None:
-            log.debug("<-%s- [%.6f] %s" % (response["id"], elapsed, json.dumps(response["result"], default=serialization_fallback, ensure_ascii=self.ensure_ascii)))
+            log.debug("<-%s- [%.6f] %s" % (response.get("id"), elapsed, json.dumps(response["result"], default=serialization_fallback, ensure_ascii=self.ensure_ascii)))
         else:
             log.debug("<-- [%.6f] %s" % (elapsed, responsedata))
         return response, http_response.status