Merge pull request #962 from dynamsoft-docs/preview

update OCR guide and Chrome 142 FAQ

Author: Ellie-dynamsoft

_articles/extended-usage/ocr.md

@@ -33,7 +33,12 @@ Download [DynamicWebTWAINOCRResources.zip](https://download2.dynamsoft.com/dwt/D
 
 It will copy an `ocr` folder to Dynamic Web TWAIN Service's [installation folder](/_articles/extended-usage/dynamsoft-service-configuration.md#installation-folder). The `ocr` folder contains the runtime and model files that are required to perform on-device OCR.
 
-PS: You need to [install Dynamic Web TWAIN Service](/_articles/extended-usage/dynamsoft-service-configuration.md#installation-of-dynamic-web-twain-service) beforehand.
+
+> [!NOTE]
+> * You need to [install Dynamic Web TWAIN Service](/_articles/extended-usage/dynamsoft-service-configuration.md#installation-of-dynamic-web-twain-service) beforehand.
+> * Since only Windows is supported for now, you have to do this on a Windows client for testing.
+
+
 
 ### Step Two - Write a Basic Document Scanning Page
 
@@ -440,6 +445,8 @@ Here is the complete code of the demo.
 </html>
 ```
 
+This complete code is different from the [online demo](#online-demo)'s code, which supports regional OCR. You can find the code for the online demo [here](https://download2.dynamsoft.com/Samples/DWT/Scan-Documents-and-Do-OCR.zip).
+
 ## FAQ
 
 ### What Languages are Supported?
@@ -458,7 +465,7 @@ Yes. You can specify which regions for OCR using the `rects` option of the [`rec
 
 ### Will My Document be Uploaded to a Remote Server?
 
-No. The OCR process happens locally on your machine. No data is sent to any remote servers.
+No. The OCR process happens locally on your machine. No data is sent to any remote servers. Also, we do not collect data for training AI.
 
 ### What is Searchable PDF?
 

_articles/faq/chromium-142-local-network-access-issue.md

@@ -7,7 +7,7 @@ keywords: Dynamic Web TWAIN, Error Troubleshooting, CORS, unknown address space,
 breadcrumbText: Error message - Permission was denied for this request to access the unknown address space
 description: CORS unknown address space
 date: 2025-11-04 17:21:42 +0800
-last_modified: 2025-11-26 15:46:00 +0800
+last_modified: 2025-12-12 10:04:00 +0800
 ---
 
 # Error Troubleshooting
@@ -19,7 +19,7 @@ last_modified: 2025-11-26 15:46:00 +0800
 
 ### Overview
 
-Starting in **Chromium-based browsers v142+** (released Oct 28, 2025)—including Chrome, Edge, Brave, and Opera—Dynamsoft Web TWAIN Service may not work as expected due to new local-network security rules.
+Starting in **Chromium-based browsers v142+** (released Oct 28, 2025)—including Chrome, Edge, Brave, and Opera—Dynamsoft Web TWAIN Service may not work as expected due to new **Local Network Access (LNA)** restrictions that limit requests **from public network locations to private and loopback network locations**.
 
 ### Symptoms
 
@@ -41,6 +41,8 @@ from origin 'https://your-domain.com' has been blocked by CORS policy:
 Permission was denied for this request to access the `unknown` address space.
 ```
 
+This error occurs because the web page is loaded from a public network origin (for example, `https://your-domain.com`) and is attempting to connect to a loopback network location (`127.0.0.1`), which Chrome now treats as a protected local network request.
+
 ---
 
 #### Version-Specific Behavior
@@ -59,10 +61,14 @@ The observed behavior depends on Chromium browser version and Dynamic Web TWAIN
 
 ### Root Cause
 
-Chromium 142 introduces a new [Local Network Access security policy](https://chromestatus.com/feature/5152728072060928) requirement. 
-Requests from web pages to loopback addresses such as `localhost` / `127.0.0.1` are blocked unless the user (or an admin policy) explicitly grants access.
+Chromium 142 introduces and enforces a new [Local Network Access (LNA)](https://chromestatus.com/feature/5152728072060928) security model that restricts requests **from public network locations to private and loopback network locations**, requiring explicit user permission.
+
+> [!NOTE]
+> For background and design rationale, see Chrome’s Developer Blog: [New permission prompt for Local Network Access](https://developer.chrome.com/blog/local-network-access).
+
+Under this model, **requests originating from a public network location** (such as a publicly hosted website) **to private or loopback network locations** (including localhost and 127.0.0.1) are blocked by default unless the user explicitly grants permission.
 
-Because Dynamic Web TWAIN communicates with a local service, these restrictions can prevent normal operation.
+Dynamic Web TWAIN relies on a locally installed service that listens on a loopback address. When a web application hosted on a public domain attempts to communicate with this service, Chrome categorizes the request as a **public-to-local** network request, which now requires explicit user consent.
 
 ### Resolution
 
@@ -170,6 +176,6 @@ Here are the details:
 
 This design will be integrated in v19.3. For old versions, we can include an extra js file, which can be retrieved by contacting [support](mailto://support@dynamsoft.com).
 
-## Other Causes
+## Other Causes of Failure to Connect to the Service
 
 There are other causes of service not being connected. You can find them in [another FAQ](/_articles/faq/service-prompting-to-install-repeatedly.md).

_articles/info/api/appendix.md

@@ -63,7 +63,7 @@ description: Dynamic Web TWAIN SDK Documentation API Appendix Page
 |-2207 | The Dynamic Web TWAIN Service installed on your computer is outdated and no longer works with the JavaScript code on the website |
 |-2208 | The connection with the local Dynamic Web TWAIN Service encountered a problem and has been reset |
 |-2209 | The HTML5 (Chrome&Firefox) edition does not support this method or property |
-|-2217 | Missing dependent files for OCR.  |
+|-2217 | Missing dependent files for OCR Kit.  |
 |-2300 | Http upload error: the HTTP Server cannot empty |
 |-2301 | Network error |
 |-2302 | The result format is invalid |