diff --git a/docs/api.md b/docs/api.md
index 5b5d4d25..18a0c15d 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -91,6 +91,7 @@ In multipart mode, `duration` `filesize` `url` field in `MediaDataSource` struct
 | `reuseRedirectedURL?`            | `boolean` | `false`                      | Reuse 301/302 redirected url for subsequence request like seek, reconnect, etc. |
 | `referrerPolicy?`                | `string`  | `no-referrer-when-downgrade` | Indicates the [Referrer Policy][] when using FetchStreamLoader |
 | `headers?`                       | `object`  | `undefined`                  | Indicates additional headers that will be added to request |
+| `requestTimeout?`                | `number`  | `Infinity`                   | Timeout setting for IO Connection, in **milliseconds**. `requestTimeout` must greater than zero. |
 
 
 [Referrer Policy]: https://w3c.github.io/webappsec-referrer-policy/#referrer-policy
diff --git a/src/config.js b/src/config.js
index 7dd6a79d..e6ea56c3 100644
--- a/src/config.js
+++ b/src/config.js
@@ -50,7 +50,8 @@ export const defaultConfig = {
     // referrerPolicy: leave as unspecified
 
     headers: undefined,
-    customLoader: undefined
+    customLoader: undefined,
+    requestTimeout: Infinity,
 };
 
 export function createDefaultConfig() {
diff --git a/src/io/fetch-stream-loader.js b/src/io/fetch-stream-loader.js
index c04da5b0..a087fb32 100644
--- a/src/io/fetch-stream-loader.js
+++ b/src/io/fetch-stream-loader.js
@@ -121,6 +121,12 @@ class FetchStreamLoader extends BaseLoader {
         if (self.AbortController) {
             this._abortController = new self.AbortController();
             params.signal = this._abortController.signal;
+
+            if (this._config.requestTimeout !== Infinity && this._config.requestTimeout > 0) {
+                this._timeoutId = self.setTimeout(() => {
+                    this.abort('timeout');
+                }, this._config.requestTimeout);
+            }
         }
 
         this._status = LoaderStatus.kConnecting;
@@ -130,6 +136,9 @@ class FetchStreamLoader extends BaseLoader {
                 res.body.cancel();
                 return;
             }
+
+            this.clearFetchTimeout();
+
             if (res.ok && (res.status >= 200 && res.status <= 299)) {
                 if (res.url !== seekConfig.url) {
                     if (this._onURLRedirect) {
@@ -159,9 +168,19 @@ class FetchStreamLoader extends BaseLoader {
             }
         }).catch((e) => {
             if (this._abortController && this._abortController.signal.aborted) {
+                if (this._abortController.signal.reason === 'timeout') {
+                    this._status = LoaderStatus.kError;
+                    if (this._onError) {
+                        this._onError(LoaderErrors.CONNECTING_TIMEOUT, {code: -1, msg: 'fetch stream loader connecting timeout'});
+                    } else {
+                        throw new RuntimeException('FetchStreamLoader: connecting timeout');
+                    }
+                }
                 return;
             }
 
+            this.clearFetchTimeout();
+
             this._status = LoaderStatus.kError;
             if (this._onError) {
                 this._onError(LoaderErrors.EXCEPTION, {code: -1, msg: e.message});
@@ -171,14 +190,16 @@ class FetchStreamLoader extends BaseLoader {
         });
     }
 
-    abort() {
+    abort(reason) {
         this._requestAbort = true;
 
+        this.clearFetchTimeout();
+
         if (this._status !== LoaderStatus.kBuffering || !Browser.chrome) {
             // Chrome may throw Exception-like things here, avoid using if is buffering
             if (this._abortController) {
                 try {
-                    this._abortController.abort();
+                    this._abortController.abort(reason);
                 } catch (e) {}
             }
         }
@@ -261,6 +282,12 @@ class FetchStreamLoader extends BaseLoader {
         });
     }
 
+    clearFetchTimeout() {
+        if (this._timeoutId) {
+            self.clearTimeout(this._timeoutId);
+            this._timeoutId = null;
+        }
+    }
 }
 
 export default FetchStreamLoader;
diff --git a/src/io/io-controller.js b/src/io/io-controller.js
index 5ccf1a96..fbe66d38 100644
--- a/src/io/io-controller.js
+++ b/src/io/io-controller.js
@@ -21,7 +21,6 @@ import SpeedSampler from './speed-sampler.js';
 import {LoaderStatus, LoaderErrors} from './loader.js';
 import FetchStreamLoader from './fetch-stream-loader.js';
 import MozChunkedLoader from './xhr-moz-chunked-loader.js';
-import MSStreamLoader from './xhr-msstream-loader.js';
 import RangeLoader from './xhr-range-loader.js';
 import WebSocketLoader from './websocket-loader.js';
 import RangeSeekHandler from './range-seek-handler.js';
diff --git a/src/io/xhr-moz-chunked-loader.js b/src/io/xhr-moz-chunked-loader.js
index e6605046..45ddda9c 100644
--- a/src/io/xhr-moz-chunked-loader.js
+++ b/src/io/xhr-moz-chunked-loader.js
@@ -112,6 +112,19 @@ class MozChunkedLoader extends BaseLoader {
             }
         }
 
+        if (this._config.requestTimeout !== Infinity && this._config.requestTimeout > 0) {
+            xhr.requestTimeoutId = window.setTimeout(() => {
+                xhr.abort();
+
+                this._status = LoaderStatus.kError;
+                if (this._onError) {
+                    this._onError(LoaderErrors.CONNECTING_TIMEOUT, {code: -1, msg: 'MozChunkedLoader connecting timeout'});
+                } else {
+                    throw new RuntimeException('MozChunkedLoader: connecting timeout');
+                }
+            }, this._config.requestTimeout);
+        }
+
         this._status = LoaderStatus.kConnecting;
         xhr.send();
     }
@@ -119,6 +132,7 @@ class MozChunkedLoader extends BaseLoader {
     abort() {
         this._requestAbort = true;
         if (this._xhr) {
+            this._clearRequestTimeout();
             this._xhr.abort();
         }
         this._status = LoaderStatus.kComplete;
@@ -128,6 +142,8 @@ class MozChunkedLoader extends BaseLoader {
         let xhr = e.target;
 
         if (xhr.readyState === 2) {  // HEADERS_RECEIVED
+            this._clearRequestTimeout();
+
             if (xhr.responseURL != undefined && xhr.responseURL !== this._requestURL) {
                 if (this._onURLRedirect) {
                     let redirectedURL = this._seekHandler.removeURLParameters(xhr.responseURL);
@@ -187,6 +203,8 @@ class MozChunkedLoader extends BaseLoader {
     }
 
     _onXhrError(e) {
+        this._clearRequestTimeout();
+
         this._status = LoaderStatus.kError;
         let type = 0;
         let info = null;
@@ -206,6 +224,12 @@ class MozChunkedLoader extends BaseLoader {
         }
     }
 
+    _clearRequestTimeout() {
+        if (this._xhr && this._xhr.requestTimeoutId) {
+            clearTimeout(this._xhr.requestTimeoutId);
+            this._xhr.requestTimeoutId = undefined;
+        }
+    }
 }
 
 export default MozChunkedLoader;
\ No newline at end of file
diff --git a/src/io/xhr-range-loader.js b/src/io/xhr-range-loader.js
index 342a3808..5a403cf7 100644
--- a/src/io/xhr-range-loader.js
+++ b/src/io/xhr-range-loader.js
@@ -170,6 +170,19 @@ class RangeLoader extends BaseLoader {
             }
         }
 
+        if (this._config.requestTimeout !== Infinity && this._config.requestTimeout > 0) {
+            xhr.requestTimeoutId = window.setTimeout(() => {
+                xhr.abort();
+
+                this._status = LoaderStatus.kError;
+                if (this._onError) {
+                    this._onError(LoaderErrors.CONNECTING_TIMEOUT, {code: -1, msg: 'RangeLoader connecting timeout'});
+                } else {
+                    throw new RuntimeException('RangeLoader: connecting timeout');
+                }
+            }, this._config.requestTimeout);
+        }
+
         xhr.send();
     }
 
@@ -181,6 +194,7 @@ class RangeLoader extends BaseLoader {
 
     _internalAbort() {
         if (this._xhr) {
+            this._clearRequestTimeout();
             this._xhr.onreadystatechange = null;
             this._xhr.onprogress = null;
             this._xhr.onload = null;
@@ -194,6 +208,8 @@ class RangeLoader extends BaseLoader {
         let xhr = e.target;
 
         if (xhr.readyState === 2) {  // HEADERS_RECEIVED
+            this._clearRequestTimeout();
+
             if (xhr.responseURL != undefined) {  // if the browser support this property
                 let redirectedURL = this._seekHandler.removeURLParameters(xhr.responseURL);
                 if (xhr.responseURL !== this._currentRequestURL && redirectedURL !== this._currentRedirectedURL) {
@@ -341,6 +357,8 @@ class RangeLoader extends BaseLoader {
     }
 
     _onXhrError(e) {
+        this._clearRequestTimeout();
+
         this._status = LoaderStatus.kError;
         let type = 0;
         let info = null;
@@ -361,6 +379,12 @@ class RangeLoader extends BaseLoader {
         }
     }
 
+    _clearRequestTimeout() {
+        if (this._xhr && this._xhr.requestTimeoutId) {
+            clearTimeout(this._xhr.requestTimeoutId);
+            this._xhr.requestTimeoutId = undefined;
+        }
+    }
 }
 
 export default RangeLoader;
\ No newline at end of file