RFR: 8297609: Add application/wasm MIME type for wasm file extension

[Jaikiran Pai]

On Tue, 22 Nov 2022 10:43:42 GMT, Michal Karm Babacek <duke at openjdk.org> wrote:

> 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:
> 
> ![bad](https://user-images.githubusercontent.com/691097/203292673-dff79256-7286-42b1-9b72-60ff6e9aadd3.png)
> 
> 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`:
> 
> ![good](https://user-images.githubusercontent.com/691097/203293296-77ff4913-b86d-45fe-976e-8cbcde79da36.png)
> 
> Thank you for your time.
> 
> Cheers
> K.

src/java.base/unix/classes/sun/net/www/content-types.properties line 400:

> 398: 
> 399: application/wasm: \
> 400: 	description=WASM File;\

Perhaps the description could be `WebAssembly File;`? Same in the Windows' file.

-------------

PR: https://git.openjdk.org/jdk/pull/11284