diff --git a/README.md b/README.md
index 8fcb073..7f8947c 100644
--- a/README.md
+++ b/README.md
@@ -57,15 +57,20 @@ For more context on this SDK, you may be interested in this
 # Supported platforms
 
 The `@openziti/ziti-sdk-nodejs` module works with the following Node.js versions:
-- v12.x
-- v13.x
-- v14.x
-- v15.x
 - v16.x
-- v17.x
 - v18.x
+- v19.x
+- v20.x
+
+The `@openziti/ziti-sdk-nodejs` module works with the following architectures:
+- amd64
+- arm64
+
+The `@openziti/ziti-sdk-nodejs` module works with the following Operating Systems:
+- macos
+- linux
+- windows
 
-Binaries for most Node versions and platforms are provided by default via [@mapbox/node-pre-gyp](https://github.com/mapbox/node-pre-gyp).
 
 # Installing
 
@@ -107,6 +112,7 @@ const on_resp_data = ( obj ) => {
 // Perform an HTTP GET request to a dark OpenZiti web service
 ziti.httpRequest(
   'myDarkWebService',            // OpenZiti Service name or HTTP origin part of the URL
+  undefined,                     // schemeHostPort parm is mutually-exclusive with serviceName parm
   'GET',
   '/',                           // path part of the URL including query params
   ['Accept: application/json' ], // headers
@@ -221,4 +227,18 @@ for tracking bugs and feature requests and have limited bandwidth to address the
 - Participate in discussion on [Discourse](https://openziti.discourse.group/)
 
 
+# Building from source on MacOS
+
+``` js
+git clone https://github.com/microsoft/vcpkg.git
+./vcpkg/bootstrap-vcpkg.sh
+export VCPKG_ROOT=`pwd`/vcpkg
+brew install cmake
+brew install ninja
+brew install pkg-config
+git clone https://github.com/openziti/ziti-sdk-nodejs.git
+cd ziti-sdk-nodejs
+npm run build
+```
+
 Copyright©  NetFoundry, Inc.
diff --git a/package-lock.json b/package-lock.json
index 74f48e9..6850e72 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@openziti/ziti-sdk-nodejs",
-  "version": "0.14.0-dev",
+  "version": "0.14.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@openziti/ziti-sdk-nodejs",
-      "version": "0.14.0-dev",
+      "version": "0.14.0",
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {
diff --git a/package.json b/package.json
index 81a8e38..4b417ce 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openziti/ziti-sdk-nodejs",
   "description": "A NodeJS-based SDK for delivering secure applications over a Ziti Network",
-  "version": "0.14.0",
+  "version": "0.14.1",
   "main": "./lib/ziti",
   "scripts": {
     "build": "npm run build:init && npm run build:configure && npm run build:make",
diff --git a/src/Ziti_https_request.c b/src/Ziti_https_request.c
index deb36e2..3cacfd1 100644
--- a/src/Ziti_https_request.c
+++ b/src/Ziti_https_request.c
@@ -606,12 +606,14 @@ void on_resp(tlsuv_http_resp_t *resp, void *data) {
   }
 
   // Initiate the call into the JavaScript callback. The call into JavaScript will not have happened when this function returns, but it will be queued.
-  int rc = napi_call_threadsafe_function(
-      addon_data->tsfn_on_resp,
-      item,
-      napi_tsfn_blocking);
-  if (rc != napi_ok) {
-    napi_throw_error(addon_data->env, "EINVAL", "failure to invoke JS callback");
+  if (addon_data->tsfn_on_resp != NULL) {
+    int rc = napi_call_threadsafe_function(
+        addon_data->tsfn_on_resp,
+        item,
+        napi_tsfn_blocking);
+    if (rc != napi_ok) {
+      napi_throw_error(addon_data->env, "EINVAL", "failure to invoke JS callback");
+    }
   }
 
   if (UV_EOF != resp->code) {
@@ -711,12 +713,14 @@ void on_client(uv_work_t* req, int status) {
   }
 
   // Initiate the call into the JavaScript callback. The call into JavaScript will not have happened when this function returns, but it will be queued.
-  int rc = napi_call_threadsafe_function(
-      addon_data->tsfn_on_req,
-      addon_data,
-      napi_tsfn_blocking);
-  if (rc != napi_ok) {
-    napi_throw_error(addon_data->env, "EINVAL", "failure to invoke JS callback");
+  if (addon_data->tsfn_on_req != NULL) {
+    int rc = napi_call_threadsafe_function(
+        addon_data->tsfn_on_req,
+        addon_data,
+        napi_tsfn_blocking);
+    if (rc != napi_ok) {
+      napi_throw_error(addon_data->env, "EINVAL", "failure to invoke JS callback");
+    }
   }
 }
 
@@ -908,73 +912,89 @@ napi_value _Ziti_http_request(napi_env env, const napi_callback_info info) {
 
   ZITI_NODEJS_LOG(DEBUG, "path: %s", addon_data->path);
 
+  HttpsReq* httpsReq = calloc(1, sizeof(HttpsReq));
+  addon_data->httpsReq = httpsReq;
+  httpsReq->addon_data = addon_data;
+
   // Obtain ptr to JS on_req callback function
   napi_value js_cb = args[5];
   napi_value work_name;
 
+  status = napi_typeof(env, args[5], &valuetype);
+  if (valuetype != napi_undefined) {
+    ZITI_NODEJS_LOG(DEBUG, "on_req callback is specified");
 
-  HttpsReq* httpsReq = calloc(1, sizeof(HttpsReq));
-  addon_data->httpsReq = httpsReq;
-  httpsReq->addon_data = addon_data;
+    // Create a string to describe this asynchronous operation.
+    rc = napi_create_string_utf8(env, "on_req", NAPI_AUTO_LENGTH, &work_name);
+    if (rc != napi_ok) {
+      napi_throw_error(env, "EINVAL", "Failed to create string");
+      return NULL;
+    }
 
-  // Create a string to describe this asynchronous operation.
-  rc = napi_create_string_utf8(env, "on_req", NAPI_AUTO_LENGTH, &work_name);
-  if (rc != napi_ok) {
-    napi_throw_error(env, "EINVAL", "Failed to create string");
-    return NULL;
+    // Convert the callback retrieved from JavaScript into a thread-safe function (tsfn) 
+    // which we can call from a worker thread.
+    rc = napi_create_threadsafe_function(
+      env,
+      js_cb,
+      NULL,
+      work_name,
+      0,
+      1,
+      NULL,
+      NULL,
+      NULL,
+      CallJs_on_req,
+      &(addon_data->tsfn_on_req)
+    );
+    ZITI_NODEJS_LOG(DEBUG, "2: %d", rc);
+    if (rc != napi_ok) {
+      napi_throw_error(env, "EINVAL", "Failed to create threadsafe_function");
+      return NULL;
+    }
+    ZITI_NODEJS_LOG(DEBUG, "napi_create_threadsafe_function addon_data->tsfn_on_req() : %p", addon_data->tsfn_on_req);
   }
-
-  // Convert the callback retrieved from JavaScript into a thread-safe function (tsfn) 
-  // which we can call from a worker thread.
-  rc = napi_create_threadsafe_function(
-    env,
-    js_cb,
-    NULL,
-    work_name,
-    0,
-    1,
-    NULL,
-    NULL,
-    NULL,
-    CallJs_on_req,
-    &(addon_data->tsfn_on_req)
-  );
-  if (rc != napi_ok) {
-    napi_throw_error(env, "EINVAL", "Failed to create threadsafe_function");
-    return NULL;
+  else {
+    ZITI_NODEJS_LOG(DEBUG, "on_req callback is NOT specified");
   }
-  ZITI_NODEJS_LOG(DEBUG, "napi_create_threadsafe_function addon_data->tsfn_on_req() : %p", addon_data->tsfn_on_req);
 
   // Obtain ptr to JS on_resp callback function
   napi_value js_cb2 = args[6];
 
-  // Create a string to describe this asynchronous operation.
-  rc = napi_create_string_utf8(env, "on_resp", NAPI_AUTO_LENGTH, &work_name);
-  if (rc != napi_ok) {
-    napi_throw_error(env, "EINVAL", "Failed to create string");
-    return NULL;
-  }
+  status = napi_typeof(env, args[6], &valuetype);
+  if (valuetype != napi_undefined) {
+    ZITI_NODEJS_LOG(DEBUG, "on_resp callback is specified");
 
-  // Convert the callback retrieved from JavaScript into a thread-safe function (tsfn) 
-  // which we can call from a worker thread.
-  rc = napi_create_threadsafe_function(
-    env,
-    js_cb2,
-    NULL,
-    work_name,
-    0,
-    1,
-    NULL,
-    NULL,
-    NULL,
-    CallJs_on_resp,
-    &(addon_data->tsfn_on_resp)
-  );
-  if (rc != napi_ok) {
-    napi_throw_error(env, "EINVAL", "Failed to create threadsafe_function");
-    return NULL;
+    // Create a string to describe this asynchronous operation.
+    rc = napi_create_string_utf8(env, "on_resp", NAPI_AUTO_LENGTH, &work_name);
+    if (rc != napi_ok) {
+      napi_throw_error(env, "EINVAL", "Failed to create string");
+      return NULL;
+    }
+
+    // Convert the callback retrieved from JavaScript into a thread-safe function (tsfn) 
+    // which we can call from a worker thread.
+    rc = napi_create_threadsafe_function(
+      env,
+      js_cb2,
+      NULL,
+      work_name,
+      0,
+      1,
+      NULL,
+      NULL,
+      NULL,
+      CallJs_on_resp,
+      &(addon_data->tsfn_on_resp)
+    );
+    if (rc != napi_ok) {
+      napi_throw_error(env, "EINVAL", "Failed to create threadsafe_function");
+      return NULL;
+    }
+    ZITI_NODEJS_LOG(DEBUG, "napi_create_threadsafe_function addon_data->tsfn_on_resp() : %p", addon_data->tsfn_on_resp);
+  }
+    else {
+    ZITI_NODEJS_LOG(DEBUG, "on_resp callback is NOT specified");
   }
-  ZITI_NODEJS_LOG(DEBUG, "napi_create_threadsafe_function addon_data->tsfn_on_resp() : %p", addon_data->tsfn_on_resp);
 
 
   // Obtain ptr to JS on_resp_data callback function
diff --git a/src/ziti_init.c b/src/ziti_init.c
index a369fe1..99d8623 100644
--- a/src/ziti_init.c
+++ b/src/ziti_init.c
@@ -323,6 +323,8 @@ napi_value _ziti_init(napi_env env, const napi_callback_info info) {
         napi_throw_error(env, NULL, "Failed to napi_create_threadsafe_function");
     }
 
+    ziti_log_init(thread_loop, ZITI_LOG_DEFAULT_LEVEL, NULL);
+
     ziti_config cfg = {0};
 
     int rc = ziti_load_config(&cfg, config_file_name);