Fix: gRPC Web compilation with Emscripten

 Compiling gRPC Web with Emscripten involves several steps, as Emscripten is a toolchain for compiling C/C++ code into WebAssembly. Here's a general guide to help you get started:


1. **Install Emscripten:**

   - Install Emscripten by following the instructions in the [official Emscripten documentation](https://emscripten.org/docs/getting_started/downloads.html).


2. **Clone gRPC Web Repository:**

   - Clone the gRPC Web repository from GitHub:

     ```bash

     git clone https://github.com/grpc/grpc-web.git

     ```


3. **Navigate to gRPC Web Repository:**

   - Change your working directory to the gRPC Web repository:

     ```bash

     cd grpc-web

     ```


4. **Build gRPC Web with Emscripten:**

   - Use Emscripten to compile gRPC Web's C++ code to WebAssembly. You'll need to configure the build to target WebAssembly. Typically, you'd run something like this:

     ```bash

     emcmake cmake .

     emmake make

     ```


5. **Generate gRPC Web JavaScript Code:**

   - After compiling with Emscripten, you should have WebAssembly binaries. You need to generate JavaScript code that provides an interface to the WebAssembly modules. This can be done with a script provided by gRPC Web:

     ```bash

     cd net/grpc/gateway/protoc-gen-grpc-gateway

     go run generate.go

     ```


6. **Use the Generated JavaScript in Your Web Application:**

   - You can now include the generated JavaScript code in your web application to interact with gRPC services using gRPC Web in a browser.


Please note that the process may vary depending on the specific version of gRPC Web and Emscripten you are using. Make sure to refer to the documentation and build instructions of gRPC Web for your particular version, as they may be subject to changes and updates.


Additionally, you may need to consider issues such as cross-origin requests when working with gRPC Web in a web browser. Depending on your project requirements, you might have to set up suitable server configurations and deal with browser security restrictions when making gRPC requests.

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