diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e238d2..d74ee29 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## 3.0.0
 
+- Feature #158: support removing headers which were previously set via "setHeader"
+
 - :warning: **Breaking Change**: Dropped support for Android < 5.1
 - :warning: **Breaking Change**: Removed "disableRedirect", use "setFollowRedirect" instead
 - :warning: **Breaking Change**: Removed "setSSLCertMode", use "setServerTrustMode" instead
diff --git a/test/js-specs.js b/test/js-specs.js
index b949be7..1cd139c 100644
--- a/test/js-specs.js
+++ b/test/js-specs.js
@@ -49,6 +49,13 @@ describe('Advanced HTTP public interface', function () {
     http.getHeaders('*').myKey.should.equal('myValue');
   });
 
+  it('clears global headers correctly when value is undefined', () => {
+    http.setHeader('*', 'myKey', 'myValue');
+    http.setHeader('*', 'myKey', null);
+    should.equal(undefined, http.getHeaders('*').myKey);
+    Object.keys(http.getHeaders('*')).length.should.be.equal(0);
+  });
+
   it('sets host headers correctly #24', () => {
     http.setHeader('www.google.de', 'myKey', 'myValue');
     http.getHeaders('www.google.de').myKey.should.equal('myValue');
diff --git a/www/helpers.js b/www/helpers.js
index a578211..805fcf7 100644
--- a/www/helpers.js
+++ b/www/helpers.js
@@ -187,7 +187,9 @@ module.exports = function init(global, jsUtil, cookieHandler, messages, base64,
   }
 
   function checkForInvalidHeaderValue(value) {
-    if (jsUtil.getTypeOf(value) !== 'String') {
+    var type = jsUtil.getTypeOf(value);
+
+    if (type !== 'String' && type !== 'Null') {
       throw new Error(messages.INVALID_HEADER_VALUE);
     }
 
diff --git a/www/messages.js b/www/messages.js
index 3a4f6b8..9fefa06 100644
--- a/www/messages.js
+++ b/www/messages.js
@@ -11,7 +11,7 @@ module.exports = {
   INVALID_DATA_SERIALIZER: 'advanced-http: invalid serializer, supported serializers are:',
   INVALID_DOWNLOAD_FILE_PATH: 'advanced-http: invalid "filePath" value, needs to be a string, <filePath: string>',
   INVALID_FOLLOW_REDIRECT_VALUE: 'advanced-http: invalid follow redirect value, needs to be a boolean value, <followRedirect: boolean>',
-  INVALID_HEADER_VALUE: 'advanced-http: invalid header value, needs to be a string, <header: string>',
+  INVALID_HEADER_VALUE: 'advanced-http: invalid header value, needs to be a string or null, <header: string | null>',
   INVALID_HTTP_METHOD: 'advanced-http: invalid HTTP method, supported methods are:',
   INVALID_RESPONSE_TYPE: 'advanced-http: invalid response type, supported types are:',
   INVALID_SSL_CERT_MODE: 'advanced-http: invalid SSL cert mode, supported modes are:',
diff --git a/www/public-interface.js b/www/public-interface.js
index eb0c86b..73f75a9 100644
--- a/www/public-interface.js
+++ b/www/public-interface.js
@@ -58,7 +58,12 @@ module.exports = function init(exec, cookieHandler, urlUtil, helpers, globalConf
     helpers.checkForInvalidHeaderValue(value);
 
     globalConfigs.headers[host] = globalConfigs.headers[host] || {};
-    globalConfigs.headers[host][header] = value;
+
+    if (value === null) {
+      delete globalConfigs.headers[host][header];
+    } else {
+      globalConfigs.headers[host][header] = value;
+    }
   }
 
   function getDataSerializer() {