[arpitjain099]

Content-Length uses Buffer.byteLength(text, 'ascii'), which counts UTF-16 code units instead of bytes, so a text/plain body of äöü is 6 bytes on the wire but renders Content-Length: 3.

erunion diagnosed this in #332 on 2023-11-03, pointing at this line and the ascii encoding. Switching the encoding to utf8 is the whole fix.

The test drives HTTPSnippet.convert for the http/http1.1 client with a non-ascii body. Every body under src/fixtures/requests is ascii, where the two encodings agree, so nothing existing moved: 747 tests before, 748 after.

Fixes #332

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[arpitjain099]

@erunion CLA signed