diff --git a/modules/sharethroughBidAdapter.js b/modules/sharethroughBidAdapter.js
index 68b2a23b8e4..ba683406588 100644
--- a/modules/sharethroughBidAdapter.js
+++ b/modules/sharethroughBidAdapter.js
@@ -1,6 +1,6 @@
 import { registerBidder } from '../src/adapters/bidderFactory';
 
-const VERSION = '3.1.0';
+const VERSION = '3.2.0';
 const BIDDER_CODE = 'sharethrough';
 const STR_ENDPOINT = 'https://btlr.sharethrough.com/WYu2BXv1/v1';
 const DEFAULT_SIZE = [1, 1];
@@ -9,7 +9,8 @@ const DEFAULT_SIZE = [1, 1];
 export const sharethroughInternal = {
   b64EncodeUnicode,
   handleIframe,
-  isLockedInFrame
+  isLockedInFrame,
+  getProtocol
 };
 
 export const sharethroughAdapterSpec = {
@@ -29,6 +30,9 @@ export const sharethroughAdapterSpec = {
         strVersion: VERSION
       };
 
+      const nonHttp = sharethroughInternal.getProtocol().indexOf('http') < 0;
+      query.secure = nonHttp || (sharethroughInternal.getProtocol().indexOf('https') > -1);
+
       if (bidderRequest && bidderRequest.gdprConsent && bidderRequest.gdprConsent.consentString) {
         query.consent_string = bidderRequest.gdprConsent.consentString;
       }
@@ -236,4 +240,8 @@ function canAutoPlayHTML5Video() {
   }
 }
 
+function getProtocol() {
+  return document.location.protocol;
+}
+
 registerBidder(sharethroughAdapterSpec);
diff --git a/test/spec/modules/sharethroughBidAdapter_spec.js b/test/spec/modules/sharethroughBidAdapter_spec.js
index a8caefc5240..e3bd5aa079a 100644
--- a/test/spec/modules/sharethroughBidAdapter_spec.js
+++ b/test/spec/modules/sharethroughBidAdapter_spec.js
@@ -40,7 +40,7 @@ const bidRequests = [
 const prebidRequests = [
   {
     method: 'GET',
-    url: 'https://btlr.sharethrough.com' + '/WYu2BXv1/v1',
+    url: 'https://btlr.sharethrough.com/WYu2BXv1/v1',
     data: {
       bidId: 'bidId',
       placement_key: 'pKey'
@@ -52,7 +52,7 @@ const prebidRequests = [
   },
   {
     method: 'GET',
-    url: 'https://btlr.sharethrough.com' + '/WYu2BXv1/v1',
+    url: 'https://btlr.sharethrough.com/WYu2BXv1/v1',
     data: {
       bidId: 'bidId',
       placement_key: 'pKey'
@@ -64,7 +64,7 @@ const prebidRequests = [
   },
   {
     method: 'GET',
-    url: 'https://btlr.sharethrough.com' + '/WYu2BXv1/v1',
+    url: 'https://btlr.sharethrough.com/WYu2BXv1/v1',
     data: {
       bidId: 'bidId',
       placement_key: 'pKey'
@@ -77,7 +77,7 @@ const prebidRequests = [
   },
   {
     method: 'GET',
-    url: 'https://btlr.sharethrough.com' + '/WYu2BXv1/v1',
+    url: 'https://btlr.sharethrough.com/WYu2BXv1/v1',
     data: {
       bidId: 'bidId',
       placement_key: 'pKey'
@@ -89,7 +89,7 @@ const prebidRequests = [
   },
   {
     method: 'GET',
-    url: 'https://btlr.sharethrough.com' + '/WYu2BXv1/v1',
+    url: 'https://btlr.sharethrough.com/WYu2BXv1/v1',
     data: {
       bidId: 'bidId',
       placement_key: 'pKey'
@@ -120,9 +120,9 @@ const bidderResponse = {
   header: { get: (header) => header }
 };
 
-const setUserAgent = (str) => {
+const setUserAgent = (uaString) => {
   window.navigator['__defineGetter__']('userAgent', function () {
-    return str;
+    return uaString;
   });
 };
 
@@ -217,10 +217,8 @@ describe('sharethrough adapter spec', function () {
     it('should return an array of requests', function () {
       const builtBidRequests = spec.buildRequests(bidRequests);
 
-      expect(builtBidRequests[0].url).to.eq(
-        'https://btlr.sharethrough.com/WYu2BXv1/v1');
-      expect(builtBidRequests[1].url).to.eq(
-        'https://btlr.sharethrough.com/WYu2BXv1/v1');
+      expect(builtBidRequests[0].url).to.eq('https://btlr.sharethrough.com/WYu2BXv1/v1');
+      expect(builtBidRequests[1].url).to.eq('https://btlr.sharethrough.com/WYu2BXv1/v1');
       expect(builtBidRequests[0].method).to.eq('GET');
     });
 
@@ -250,6 +248,27 @@ describe('sharethrough adapter spec', function () {
       expect(builtBidRequests[0].data.instant_play_capable).to.be.false;
     });
 
+    it('should set the secure parameter to false when the protocol is http', function() {
+      const stub = sinon.stub(sharethroughInternal, 'getProtocol').returns('http:');
+      const bidRequest = spec.buildRequests(bidRequests, null)[0];
+      expect(bidRequest.data.secure).to.be.false;
+      stub.restore()
+    });
+
+    it('should set the secure parameter to true when the protocol is https', function() {
+      const stub = sinon.stub(sharethroughInternal, 'getProtocol').returns('https:');
+      const bidRequest = spec.buildRequests(bidRequests, null)[0];
+      expect(bidRequest.data.secure).to.be.true;
+      stub.restore()
+    });
+
+    it('should set the secure parameter to true when the protocol is neither http or https', function() {
+      const stub = sinon.stub(sharethroughInternal, 'getProtocol').returns('about:');
+      const bidRequest = spec.buildRequests(bidRequests, null)[0];
+      expect(bidRequest.data.secure).to.be.true;
+      stub.restore()
+    });
+
     it('should add consent parameters if gdprConsent is present', function () {
       const gdprConsent = { consentString: 'consent_string123', gdprApplies: true };
       const bidderRequest = { gdprConsent: gdprConsent };