RFR: 8297609: Add application/wasm MIME type for wasm file extension
Michal Karm Babacek
duke at openjdk.org
Fri Nov 25 13:20:52 UTC 2022
This PR adds a missing MIME: application/wasm and unifies the file format on tabs, as that seemed to be the winning side of the tabs/spaces war in this file.
# How to reproduce
You will need to compile a `.c` file to a `.wasm` binary. Use [Emscripten SDK](https://emscripten.org/docs/getting_started/downloads.html) for that or download the prebuilt files from this post, [out.zip](https://github.com/openjdk/jdk/files/10066496/out.zip), if you choose to trust me with your browser...
## Sources
`main.c`:
#include <stdio.h>
int main() {
printf("Hello browser debug console...\n");
}
`Server.java`:
import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.SimpleFileServer;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.file.Path;
import static java.lang.System.exit;
import static java.lang.System.out;
public class Server {
public static void main(String... args) {
if (args.length != 2) {
out.println("Usage: java Server <port> <web dir path>");
exit(1);
}
final int port = Integer.parseInt(args[0]);
final InetSocketAddress ADDR = new InetSocketAddress(InetAddress.getLoopbackAddress(), port);
final Path root = Path.of(args[1]).toAbsolutePath();
final HttpServer server = SimpleFileServer.createFileServer(ADDR, root, SimpleFileServer.OutputLevel.VERBOSE);
out.printf("Starting serving files from %s dir: http://%s:%d\n", root, ADDR.getAddress().getHostAddress(), port);
server.start();
}
}
## Build
$ mkdir out
$ emcc main.c -s WASM=1 -o out/main.html
$ ls out/
main.html main.js main.wasm
You can have these files here, built by me: [out.zip](https://github.com/openjdk/jdk/files/10066496/out.zip)
## Execution
$ java --version
openjdk 19.0.1 2022-10-18
$ javac Server.java
$ java Server 8888 ./out/
Starting serving files from /tmp/hello_wasm/./out dir: http://127.0.0.1:8888
When I open my Firefox 106.0.5 (64-bit), I can see that the Java server offers the `.wasm` file with a suboptimal `application/octet-stream` MIME:

When I switch to the JDK patched with this patch and run the server again:
$ java Server 8888 ./out/
Starting serving files from /tmp/hello_wasm/./out dir: http://127.0.0.1:8888
I can see that the `.wasm` file is properly served to Firefox as `application/wasm`:

Thank you for your time.
Cheers
K.
-------------
Commit messages:
- Adds missing MIME application/wasm
Changes: https://git.openjdk.org/jdk/pull/11284/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11284&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8297609
Stats: 20 lines in 2 files changed: 8 ins; 0 del; 12 mod
Patch: https://git.openjdk.org/jdk/pull/11284.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/11284/head:pull/11284
PR: https://git.openjdk.org/jdk/pull/11284
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