diff --git a/package.json b/package.json
index d57d81c3..564ea2ec 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "dropbox",
-    "version": "10.14.0",
+    "version": "10.15.0",
     "registry": "npm",
     "description": "The Dropbox JavaScript SDK is a lightweight, promise based interface to the Dropbox v2 API that works in both nodejs and browser environments.",
     "main": "cjs/index.js",
diff --git a/src/dropbox.js b/src/dropbox.js
index 925fc75a..089a669a 100644
--- a/src/dropbox.js
+++ b/src/dropbox.js
@@ -86,6 +86,8 @@ export default class Dropbox {
         auth = TEAM_AUTH;
       } else if (authTypes.includes(APP_AUTH)) {
         auth = APP_AUTH;
+      } else {
+        auth = USER_AUTH; // Default to user auth
       }
     }
 
@@ -114,28 +116,9 @@ export default class Dropbox {
           fetchOptions.headers['Content-Type'] = 'application/json';
         }
 
-        let authHeader;
-        switch (auth) {
-          case APP_AUTH:
-            if (!this.auth.clientId || !this.auth.clientSecret) {
-              throw new Error('A client id and secret is required for this function');
-            }
-            authHeader = b64(`${this.auth.clientId}:${this.auth.clientSecret}`);
-            fetchOptions.headers.Authorization = `Basic ${authHeader}`;
-            break;
-          case TEAM_AUTH:
-          case USER_AUTH:
-            fetchOptions.headers.Authorization = `Bearer ${this.auth.getAccessToken()}`;
-            break;
-          case NO_AUTH:
-            break;
-          case COOKIE:
-            break;
-          default:
-            throw new Error(`Unhandled auth type: ${auth}`);
-        }
-
+        this.setAuthHeaders(auth, fetchOptions);
         this.setCommonHeaders(fetchOptions);
+
         return fetchOptions;
       })
       .then((fetchOptions) => this.fetch(
@@ -148,18 +131,14 @@ export default class Dropbox {
   downloadRequest(path, args, auth, host) {
     return this.auth.checkAndRefreshAccessToken()
       .then(() => {
-        if (auth !== USER_AUTH) {
-          throw new Error(`Unexpected auth type: ${auth}`);
-        }
-
         const fetchOptions = {
           method: 'POST',
           headers: {
-            Authorization: `Bearer ${this.auth.getAccessToken()}`,
             'Dropbox-API-Arg': httpHeaderSafeJson(args),
           },
         };
 
+        this.setAuthHeaders(auth, fetchOptions);
         this.setCommonHeaders(fetchOptions);
 
         return fetchOptions;
@@ -174,10 +153,6 @@ export default class Dropbox {
   uploadRequest(path, args, auth, host) {
     return this.auth.checkAndRefreshAccessToken()
       .then(() => {
-        if (auth !== USER_AUTH) {
-          throw new Error(`Unexpected auth type: ${auth}`);
-        }
-
         const { contents } = args;
         delete args.contents;
 
@@ -185,12 +160,12 @@ export default class Dropbox {
           body: contents,
           method: 'POST',
           headers: {
-            Authorization: `Bearer ${this.auth.getAccessToken()}`,
             'Content-Type': 'application/octet-stream',
             'Dropbox-API-Arg': httpHeaderSafeJson(args),
           },
         };
 
+        this.setAuthHeaders(auth, fetchOptions);
         this.setCommonHeaders(fetchOptions);
 
         return fetchOptions;
@@ -202,6 +177,28 @@ export default class Dropbox {
       .then((res) => parseResponse(res));
   }
 
+  setAuthHeaders(auth, fetchOptions) {
+    switch (auth) {
+      case APP_AUTH:
+        if (this.auth.clientId && this.auth.clientSecret) {
+          const authHeader = b64(`${this.auth.clientId}:${this.auth.clientSecret}`);
+          fetchOptions.headers.Authorization = `Basic ${authHeader}`;
+        }
+        break;
+      case TEAM_AUTH:
+      case USER_AUTH:
+        if (this.auth.getAccessToken()) {
+          fetchOptions.headers.Authorization = `Bearer ${this.auth.getAccessToken()}`;
+        }
+        break;
+      case NO_AUTH:
+      case COOKIE:
+        break;
+      default:
+        throw new Error(`Unhandled auth type: ${auth}`);
+    }
+  }
+
   setCommonHeaders(options) {
     if (this.selectUser) {
       options.headers['Dropbox-API-Select-User'] = this.selectUser;
diff --git a/test/unit/dropbox.js b/test/unit/dropbox.js
index cad8a22f..8b7f192c 100644
--- a/test/unit/dropbox.js
+++ b/test/unit/dropbox.js
@@ -134,23 +134,6 @@ describe('Dropbox', () => {
       chai.assert.equal('path', dbx.uploadRequest.getCall(0).args[0]);
       chai.assert.deepEqual({}, dbx.uploadRequest.getCall(0).args[1]);
     });
-
-    it('throws an error for team auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.uploadRequest('path', {}, TEAM_AUTH, 'api'), Error, `Unexpected auth type: ${TEAM_AUTH}`);
-    });
-    it('throws an error for app auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.uploadRequest('path', {}, APP_AUTH, 'api'), Error, `Unexpected auth type: ${APP_AUTH}`);
-    });
-    it('throws an error for no-auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.uploadRequest('path', {}, NO_AUTH, 'api'), Error, `Unexpected auth type: ${NO_AUTH}`);
-    });
-    it('throws an error for cookie auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.uploadRequest('path', {}, COOKIE, 'api'), Error, `Unexpected auth type: ${COOKIE}`);
-    });
   });
 
   describe('Download Requests', () => {
@@ -165,26 +148,6 @@ describe('Dropbox', () => {
       chai.assert.equal('path', dbx.downloadRequest.getCall(0).args[0]);
       chai.assert.deepEqual({}, dbx.downloadRequest.getCall(0).args[1]);
     });
-
-    it('throws an error for team auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.downloadRequest('path', {}, TEAM_AUTH, 'api'), Error, `Unexpected auth type: ${TEAM_AUTH}`);
-    });
-
-    it('throws an error for app auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.downloadRequest('path', {}, APP_AUTH, 'api'), Error, `Unexpected auth type: ${APP_AUTH}`);
-    });
-
-    it('throws an error for no-auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.downloadRequest('path', {}, NO_AUTH, 'api'), Error, `Unexpected auth type: ${NO_AUTH}`);
-    });
-
-    it('throws an error for cookie auth', () => {
-      const dbx = new Dropbox();
-      return chai.assert.isRejected(dbx.downloadRequest('path', {}, COOKIE, 'api'), Error, `Unexpected auth type: ${COOKIE}`);
-    });
   });
 
   describe('pathRoot', () => {