Attach correct Content-Type to HTTP header

[KSXGitHub]

Fix #4553.

Test

I did not add any test. My attempt to use deno test to run file_server_test.ts has not been successful.

[CLAassistant]

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[ry]

Thanks - no need to add a test.

[KSXGitHub]

@ry

Thanks - no need to add a test.

Does this mean that someone else will add it for me? Tests are useful against unwanted regression.

[ry]

cargo test std_test to run the tests.

I suppose a test is useful. I was thinking that this is just an example program so it doesn't matter that much, but it should indeed have a test.

[KSXGitHub]

@ry I am trying to compile Deno (so far, without success).

[KSXGitHub]

@ry The time it takes to clone all git submodules is too long. I guess you could just merge this then?

[ry]

@KSXGitHub I added a test - please take a look.

[KSXGitHub]

@ry I tried using deno to run the script directly:

  (zsh)   deno run --allow-all --reload=https://raw.githubusercontent.com/KSXGitHub/deno/file-server-content-type/std/http/file_server.ts https://raw.githubusercontent.com/KSXGitHub/deno/file-server-content-type/std/http/file_server.ts
Download https://raw.githubusercontent.com/KSXGitHub/deno/file-server-content-type/std/http/file_server.ts
Compile https://raw.githubusercontent.com/KSXGitHub/deno/file-server-content-type/std/http/file_server.ts
error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.

► https://raw.githubusercontent.com/KSXGitHub/deno/file-server-content-type/std/http/file_server.ts:301:18

301 function main(): Promise<void> {
                     ~~~~~~~~~~~~~

[KSXGitHub]

@ry It works great! 👍

[ry]

LGTM - thanks @KSXGitHub !