diff --git a/__tests__/proxy.test.ts b/__tests__/proxy.test.ts
index b766f0c..437d05d 100644
--- a/__tests__/proxy.test.ts
+++ b/__tests__/proxy.test.ts
@@ -39,72 +39,112 @@ describe('proxy', () => {
         })
     })
 
-    it('does not return proxyUrl if variables not set', () => {
+    it('getProxyUrl does not return proxyUrl if variables not set', () => {
         let proxyUrl = pm.getProxyUrl(url.parse('https://github.com'));
         expect(proxyUrl).toBeUndefined();
     })
 
-    it('returns proxyUrl if https_proxy set for https url', () => {
+    it('getProxyUrl returns proxyUrl if https_proxy set for https url', () => {
         process.env["https_proxy"] = "https://myproxysvr";
         let proxyUrl = pm.getProxyUrl(url.parse('https://github.com'));
         expect(proxyUrl).toBeDefined();
     })
 
-    it('does not return proxyUrl if http_proxy set for https url', () => {
+    it('getProxyUrl does not return proxyUrl if http_proxy set for https url', () => {
         process.env["http_proxy"] = "https://myproxysvr";
         let proxyUrl = pm.getProxyUrl(url.parse('https://github.com'));
         expect(proxyUrl).toBeUndefined();
     })
     
-    it('returns proxyUrl if http_proxy set for http url', () => {
+    it('getProxyUrl returns proxyUrl if http_proxy set for http url', () => {
         process.env["http_proxy"] = "http://myproxysvr";
         let proxyUrl = pm.getProxyUrl(url.parse('http://github.com'));
         expect(proxyUrl).toBeDefined();
     })
 
-    it('does not return proxyUrl if only host as no_proxy list', () => {
-        process.env["https_proxy"] = "https://myproxysvr";
-        process.env["no_proxy"] = "myserver"
-        let proxyUrl = pm.getProxyUrl(url.parse('https://myserver'));
-        expect(proxyUrl).toBeUndefined();
-    })
-    
-    it('does not return proxyUrl if host in no_proxy list', () => {
+    it('getProxyUrl does not return proxyUrl if https_proxy set and in no_proxy list', () => {
         process.env["https_proxy"] = "https://myproxysvr";
         process.env["no_proxy"] = "otherserver,myserver,anotherserver:8080"
         let proxyUrl = pm.getProxyUrl(url.parse('https://myserver'));
         expect(proxyUrl).toBeUndefined();
     })
-    
-    it('does not return proxyUrl if host in no_proxy list with spaces', () => {
+
+    it('getProxyUrl returns proxyUrl if https_proxy set and not in no_proxy list', () => {
         process.env["https_proxy"] = "https://myproxysvr";
-        process.env["no_proxy"] = "otherserver, myserver ,anotherserver:8080"
-        let proxyUrl = pm.getProxyUrl(url.parse('https://myserver'));
-        expect(proxyUrl).toBeUndefined();
-    })
-    
-    it('does not return proxyUrl if host in no_proxy list with ports', () => {
-        process.env["https_proxy"] = "https://myproxysvr";
-        process.env["no_proxy"] = "otherserver, myserver:8080 ,anotherserver"
-        let proxyUrl = pm.getProxyUrl(url.parse('https://myserver:8080'));
-        expect(proxyUrl).toBeUndefined();
-    })
-    
-    it('returns proxyUrl if https_proxy set and not in no_proxy list', () => {
-        process.env["https_proxy"] = "https://myproxysvr";
-        process.env["no_proxy"] = "otherserver, myserver ,anotherserver:8080"
-        let proxyUrl = pm.getProxyUrl(url.parse('https://github.com'));
-        expect(proxyUrl).toBeDefined();
-    })
-    
-    it('returns proxyUrl if https_proxy set empty no_proxy set', () => {
-        process.env["https_proxy"] = "https://myproxysvr";
-        process.env["no_proxy"] = ""
+        process.env["no_proxy"] = "otherserver,myserver,anotherserver:8080"
         let proxyUrl = pm.getProxyUrl(url.parse('https://github.com'));
         expect(proxyUrl).toBeDefined();
     })
 
-    it('does basic http get request through proxy', async () => {
+    it('getProxyUrl does not return proxyUrl if http_proxy set and in no_proxy list', () => {
+        process.env["http_proxy"] = "http://myproxysvr";
+        process.env["no_proxy"] = "otherserver,myserver,anotherserver:8080"
+        let proxyUrl = pm.getProxyUrl(url.parse('http://myserver'));
+        expect(proxyUrl).toBeUndefined();
+    })
+
+    it('getProxyUrl returns proxyUrl if http_proxy set and not in no_proxy list', () => {
+        process.env["http_proxy"] = "http://myproxysvr";
+        process.env["no_proxy"] = "otherserver,myserver,anotherserver:8080"
+        let proxyUrl = pm.getProxyUrl(url.parse('http://github.com'));
+        expect(proxyUrl).toBeDefined();
+    })
+
+    it('checkBypass returns true if host as no_proxy list', () => {
+        process.env["no_proxy"] = "myserver"
+        let bypass = pm.checkBypass(url.parse('https://myserver'));
+        expect(bypass).toBeTruthy();
+    })
+
+    it('checkBypass returns true if host in no_proxy list', () => {
+        process.env["no_proxy"] = "otherserver,myserver,anotherserver:8080"
+        let bypass = pm.checkBypass(url.parse('https://myserver'));
+        expect(bypass).toBeTruthy();
+    })
+    
+    it('checkBypass returns true if host in no_proxy list with spaces', () => {
+        process.env["no_proxy"] = "otherserver, myserver ,anotherserver:8080"
+        let bypass = pm.checkBypass(url.parse('https://myserver'));
+        expect(bypass).toBeTruthy();
+    })
+    
+    it('checkBypass returns true if host in no_proxy list with port', () => {
+        process.env["no_proxy"] = "otherserver, myserver:8080 ,anotherserver"
+        let bypass = pm.checkBypass(url.parse('https://myserver:8080'));
+        expect(bypass).toBeTruthy();
+    })
+
+    it('checkBypass returns true if host with port in no_proxy list without port', () => {
+        process.env["no_proxy"] = "otherserver, myserver ,anotherserver"
+        let bypass = pm.checkBypass(url.parse('https://myserver:8080'));
+        expect(bypass).toBeTruthy();
+    })
+
+    it('checkBypass returns true if host in no_proxy list with default https port', () => {
+        process.env["no_proxy"] = "otherserver, myserver:443 ,anotherserver"
+        let bypass = pm.checkBypass(url.parse('https://myserver'));
+        expect(bypass).toBeTruthy();
+    })
+
+    it('checkBypass returns true if host in no_proxy list with default http port', () => {
+        process.env["no_proxy"] = "otherserver, myserver:80 ,anotherserver"
+        let bypass = pm.checkBypass(url.parse('http://myserver'));
+        expect(bypass).toBeTruthy();
+    })
+
+    it('checkBypass returns false if host not in no_proxy list', () => {
+        process.env["no_proxy"] = "otherserver, myserver ,anotherserver:8080"
+        let bypass = pm.checkBypass(url.parse('https://github.com'));
+        expect(bypass).toBeFalsy();
+    })
+    
+    it('checkBypass returns false if empty no_proxy', () => {
+        process.env["no_proxy"] = ""
+        let bypass = pm.checkBypass(url.parse('https://github.com'));
+        expect(bypass).toBeFalsy();
+    })
+
+    it('HttpClient does basic http get request through proxy', async () => {
         process.env['http_proxy'] = _proxyUrl
         const httpClient = new httpm.HttpClient();
         let res: httpm.HttpClientResponse = await httpClient.get('http://httpbin.org/get');
@@ -115,7 +155,7 @@ describe('proxy', () => {
         expect(_proxyConnects).toEqual(['httpbin.org:80'])
     })
 
-    it('does basic http get request when bypass proxy', async () => {
+    it('HttoClient does basic http get request when bypass proxy', async () => {
         process.env['http_proxy'] = _proxyUrl
         process.env['no_proxy'] = 'httpbin.org'
         const httpClient = new httpm.HttpClient();
@@ -127,7 +167,7 @@ describe('proxy', () => {
         expect(_proxyConnects).toHaveLength(0)
     })
 
-    it('does basic https get request through proxy', async () => {
+    it('HttpClient does basic https get request through proxy', async () => {
         process.env['https_proxy'] = _proxyUrl
         const httpClient = new httpm.HttpClient();
         let res: httpm.HttpClientResponse = await httpClient.get('https://httpbin.org/get');
@@ -138,7 +178,7 @@ describe('proxy', () => {
         expect(_proxyConnects).toEqual(['httpbin.org:443'])
     })
 
-    it('does basic https get request when bypass proxy', async () => {
+    it('HttpClient does basic https get request when bypass proxy', async () => {
         process.env['https_proxy'] = _proxyUrl
         process.env['no_proxy'] = 'httpbin.org'
         const httpClient = new httpm.HttpClient();
diff --git a/index.ts b/index.ts
index f39839d..2f7b475 100644
--- a/index.ts
+++ b/index.ts
@@ -35,13 +35,21 @@ export enum HttpCodes {
     GatewayTimeout = 504,
 }
 
+/**
+ * Returns the proxy URL, depending upon the supplied url and proxy environment variables.
+ * @param serverUrl  The server URL where the request will be sent. For example, https://api.github.com
+ */
+export function getProxyUrl(serverUrl: string): string {
+    let proxyUrl = pm.getProxyUrl(url.parse(serverUrl))
+    return proxyUrl ? proxyUrl.href : ''
+}
+
 const HttpRedirectCodes: number[] = [HttpCodes.MovedPermanently, HttpCodes.ResourceMoved, HttpCodes.SeeOther, HttpCodes.TemporaryRedirect, HttpCodes.PermanentRedirect];
 const HttpResponseRetryCodes: number[] = [HttpCodes.BadGateway, HttpCodes.ServiceUnavailable, HttpCodes.GatewayTimeout];
 const RetryableHttpVerbs: string[] = ['OPTIONS', 'GET', 'DELETE', 'HEAD'];
 const ExponentialBackoffCeiling = 10;
 const ExponentialBackoffTimeSlice = 5;
 
-
 export class HttpClientResponse implements ifm.IHttpClientResponse {
     constructor(message: http.IncomingMessage) {
         this.message = message;
diff --git a/proxy.ts b/proxy.ts
index c251575..76c59b0 100644
--- a/proxy.ts
+++ b/proxy.ts
@@ -1,30 +1,13 @@
 import * as url from 'url';
 
-export function getProxyUrl(reqUrl: url.Url): url.Url {
+export function getProxyUrl(reqUrl: url.Url): url.Url | undefined {
     let usingSsl = reqUrl.protocol === 'https:';
 
-    let noProxy: string = process.env["no_proxy"] || 
-                            process.env["NO_PROXY"];
-
-    let bypass: boolean;
-    if (noProxy && typeof noProxy === 'string') {
-        let bypassList = noProxy.split(',');
-        for (let i=0; i < bypassList.length; i++) {
-            let item = bypassList[i];
-            if (item && 
-                typeof item === "string" && 
-                reqUrl.host.toLocaleLowerCase() == item.trim().toLocaleLowerCase()) {
-                    bypass = true;
-                    break;
-            }
-        }
-    }
-
     let proxyUrl: url.Url;
-    if (bypass) {
+    if (checkBypass(reqUrl)) {
         return proxyUrl;
     }
-    
+
     let proxyVar: string;
     if (usingSsl) {
         proxyVar = process.env["https_proxy"] ||
@@ -40,4 +23,43 @@ export function getProxyUrl(reqUrl: url.Url): url.Url {
     }
 
     return proxyUrl;
+}
+
+
+export function checkBypass(reqUrl: url.Url): boolean {
+    if (!reqUrl.hostname) {
+        return false
+    }
+
+    let noProxy = process.env["no_proxy"] || process.env["NO_PROXY"] || '';
+    if (!noProxy) {
+        return false
+    }
+
+    // Determine the request port
+    let reqPort: number
+    if (reqUrl.port) {
+        reqPort = Number(reqUrl.port)
+    }
+    else if (reqUrl.protocol === 'http:') {
+        reqPort = 80
+    }
+    else if (reqUrl.protocol === 'https:') {
+        reqPort = 443
+    }
+
+    // Format the request hostname and hostname with port
+    let upperReqHosts = [reqUrl.hostname.toUpperCase()]
+    if (typeof reqPort === 'number') {
+        upperReqHosts.push(`${upperReqHosts[0]}:${reqPort}`)
+    }
+
+    // Compare request host against noproxy
+    for (let upperNoProxyItem of noProxy.split(',').map(x => x.trim().toUpperCase()).filter(x => x)) {
+        if (upperReqHosts.some(x => x === upperNoProxyItem)) {
+            return true
+        }
+    }
+
+    return false
 }
\ No newline at end of file