diff --git a/spec/src/constructorio.js b/spec/src/constructorio.js
index efd920dd..4fdbcac2 100644
--- a/spec/src/constructorio.js
+++ b/spec/src/constructorio.js
@@ -97,6 +97,22 @@ describe(`ConstructorIO${bundledDescriptionSuffix}`, () => {
     expect(instance.options).to.have.property('serviceUrl').to.equal('https://constructor.io');
   });
 
+  it('Should return an instance with correct serviceUrl when a http serviceUrl is passed and allowHttpServiceUrl is true', () => {
+    const clientId = 'client-id';
+    const sessionId = 'session-id';
+    const serviceUrl = 'http://constructor.io';
+    const instance = new ConstructorIO({
+      apiKey: validApiKey,
+      clientId,
+      sessionId,
+      serviceUrl,
+      allowHttpServiceUrl: true,
+    });
+
+    expect(instance).to.be.an('object');
+    expect(instance.options).to.have.property('serviceUrl').to.equal('http://constructor.io');
+  });
+
   it('Should remove any trailing slashes from the serviceUrl', () => {
     const serviceUrl = 'https://constructor.io/';
     const instance = new ConstructorIO({
diff --git a/spec/src/utils/helpers.js b/spec/src/utils/helpers.js
index 292e33c5..3231ca5c 100644
--- a/spec/src/utils/helpers.js
+++ b/spec/src/utils/helpers.js
@@ -584,30 +584,71 @@ describe('ConstructorIO - Utils - Helpers', () => {
     });
 
     describe('addHTTPSToString', () => {
-      it('Should return the url without any modification', () => {
-        const testUrl = 'https://www.constructor.io';
+      describe('when allowHttp is not given', () => {
+        it('Should return the url without any modification', () => {
+          const testUrl = 'https://www.constructor.io';
 
-        expect(addHTTPSToString(testUrl)).to.equal(testUrl);
-      });
+          expect(addHTTPSToString(testUrl)).to.equal(testUrl);
+        });
 
-      it('Should return url with no protocol with https at the beginning', () => {
-        const testUrl = 'www.constructor.io';
-        const expectedUrl = 'https://www.constructor.io';
+        it('Should return url with no protocol with https at the beginning', () => {
+          const testUrl = 'www.constructor.io';
+          const expectedUrl = 'https://www.constructor.io';
 
-        expect(addHTTPSToString(testUrl)).to.equal(expectedUrl);
-      });
+          expect(addHTTPSToString(testUrl)).to.equal(expectedUrl);
+        });
+
+        it('Should return url with an http protocol with https at the beginning', () => {
+          const testUrl = 'http://www.constructor.io';
+          const expectedUrl = 'https://www.constructor.io';
+
+          expect(addHTTPSToString(testUrl)).to.equal(expectedUrl);
+        });
+
+        it('Should not replace "http" in the middle of the url', () => {
+          const testUrl = 'http://www.constructor.io/http/';
+          const expectedUrl = 'https://www.constructor.io/http/';
+
+          expect(addHTTPSToString(testUrl)).to.equal(expectedUrl);
+        });
 
-      it('Should return url with an http protocol with https at the beginning', () => {
-        const testUrl = 'http://www.constructor.io';
-        const expectedUrl = 'https://www.constructor.io';
+        it('Should return null if param is not a string', () => {
+          const testUrl = {};
 
-        expect(addHTTPSToString(testUrl)).to.equal(expectedUrl);
+          expect(addHTTPSToString(testUrl)).to.equal(null);
+        });
       });
+      describe('when allowHttp is true', () => {
+        it('Should return the url without any modification', () => {
+          const testUrl = 'https://www.constructor.io';
 
-      it('Should return null if param is not a string', () => {
-        const testUrl = {};
+          expect(addHTTPSToString(testUrl, true)).to.equal(testUrl);
+        });
 
-        expect(addHTTPSToString(testUrl)).to.equal(null);
+        it('Should return url with no protocol with https at the beginning', () => {
+          const testUrl = 'www.constructor.io';
+          const expectedUrl = 'https://www.constructor.io';
+
+          expect(addHTTPSToString(testUrl, true)).to.equal(expectedUrl);
+        });
+
+        it('Should return url with an http protocol without any modification', () => {
+          const testUrl = 'http://localhost:8080';
+
+          expect(addHTTPSToString(testUrl, true)).to.equal(testUrl);
+        });
+
+        it('Should not replace "http" in the middle of the url', () => {
+          const testUrl = 'http://www.constructor.io/http/';
+
+          expect(addHTTPSToString(testUrl, true)).to.equal(testUrl);
+        });
+
+        it('Should return null if param is not a string', () => {
+          const testUrl = {};
+
+          expect(addHTTPSToString(testUrl, true)).to.equal(null);
+        });
       });
     });
 
diff --git a/src/constructorio.js b/src/constructorio.js
index 8a469785..b0691dd3 100644
--- a/src/constructorio.js
+++ b/src/constructorio.js
@@ -38,6 +38,7 @@ class ConstructorIO {
    * @param {object} parameters - Parameters for client instantiation
    * @param {string} parameters.apiKey - Constructor.io API key
    * @param {string} [parameters.serviceUrl='https://ac.cnstrc.com'] - API URL endpoint
+   * @param {boolean} [parameters.allowHttpServiceUrl=false] - Allow HTTP protocol in API URL endpoint
    * @param {string} [parameters.quizzesServiceUrl='https://quizzes.cnstrc.com'] - Quizzes API URL endpoint
    * @param {string} [parameters.agentServiceUrl='https://agent.cnstrc.com'] - AI Shopping Agent API URL endpoint
    * @param {string} [parameters.mediaServiceUrl='https://media-cnstrc.com'] - Media API URL endpoint
@@ -73,6 +74,7 @@ class ConstructorIO {
       apiKey,
       version: versionFromOptions,
       serviceUrl,
+      allowHttpServiceUrl = false,
       quizzesServiceUrl,
       agentServiceUrl,
       assistantServiceUrl,
@@ -121,7 +123,7 @@ class ConstructorIO {
     this.options = {
       apiKey,
       version: versionFromOptions || versionFromGlobal || computePackageVersion(),
-      serviceUrl: helpers.addHTTPSToString(normalizedServiceUrl) || 'https://ac.cnstrc.com',
+      serviceUrl: helpers.addHTTPSToString(normalizedServiceUrl, allowHttpServiceUrl) || 'https://ac.cnstrc.com',
       quizzesServiceUrl: (quizzesServiceUrl && quizzesServiceUrl.replace(/\/$/, '')) || 'https://quizzes.cnstrc.com',
       agentServiceUrl: (agentServiceUrl && agentServiceUrl.replace(/\/$/, '')) || 'https://agent.cnstrc.com',
       assistantServiceUrl: (assistantServiceUrl && assistantServiceUrl.replace(/\/$/, '')) || 'https://assistant.cnstrc.com',
diff --git a/src/types/index.d.ts b/src/types/index.d.ts
index 6ba5fc57..bd093e43 100644
--- a/src/types/index.d.ts
+++ b/src/types/index.d.ts
@@ -52,6 +52,7 @@ export interface ConstructorClientOptions {
   apiKey: string;
   version?: string;
   serviceUrl?: string;
+  allowHttpServiceUrl?: boolean;
   quizzesServiceUrl?: string;
   agentServiceUrl?: string;
   mediaServiceUrl?: string;
diff --git a/src/utils/helpers.js b/src/utils/helpers.js
index 6ffc8396..4f4b1d4d 100644
--- a/src/utils/helpers.js
+++ b/src/utils/helpers.js
@@ -350,7 +350,7 @@ const utils = {
 
     return utils.throwHttpErrorFromResponse(new Error(), response);
   },
-  addHTTPSToString(url) {
+  addHTTPSToString(url, allowHttp = false) {
     if (typeof url !== 'string') {
       return null;
     }
@@ -359,6 +359,9 @@ const utils = {
     const doesUrlStartWithHTTP = url.startsWith('http://');
 
     if (!doesUrlIncludeHTTPS && doesUrlStartWithHTTP) {
+      if (allowHttp) {
+        return url;
+      }
       return url.replace('http', 'https');
     }