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WebAssembly comes to Apache web server

Posted on October 12, 2022 by admin

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VMware Labs has unveiled an extension module for Apache’s popular web server that runs WebAssembly binaries, opening new possibilities for languages and projects to run securely in Apache.

The mod_wasm extension module allows the Apache HTTP Server to reply to HTTP requests with applications compiled to WebAssembly. Internally, mod_wasm uses the Wasmtime secure runtime to configure and run Wasm modules.

When an Apache HTTP Server is run with mod_wasm enabled, the Wasm module is preloaded into memory as part of a process to speed up request handling by not loading the Wasm module from scratch every time a request is received.

Unveiled on GitHub earlier this month, mod-wasm is composed of two libraries:

  • mod_wasm.so, which provides an interface between the Apache C API and Rust library to manage the Wasm runtime. This library is responsible for Apache configuration options and the bindings to connect the Rust library with Apache.
  • libwasm._runtime.so, which receives HTTP requests from Apache, configuring and running the Wasm module. It also parses the response and returns control to mod_wasm.so.

WebAssembly, or Wasm, is a binary instruction format and stack-based virtual machine that provides high performance for web applications. It was designed as a portable compilation target for programming languages including C, C++, and Rust.

Copyright © 2022 IDG Communications, Inc.

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