lambda-express automatically [sets the charset to utf-8 for JSON responses](https://github.com/silvermine/lambda-express/blob/c7396116de1686f60ac8e7970729ba2ed6e2f610/src/Response.ts#L446), but does not do so [for text responses](https://github.com/silvermine/lambda-express/blob/c7396116de1686f60ac8e7970729ba2ed6e2f610/src/Response.ts#L550). Looking at behavior of `send` in express, the charset [will be set for string responses](https://github.com/expressjs/express/blob/dc538f6e810bd462c98ee7e6aae24c64d4b1da93/lib/response.js#L163-L172) (added in [expressjs/express#f14e39d4](https://github.com/expressjs/express/commit/f14e39d4515c81c1e5c980b7ce31566eeeb84734)). This issue is to investigate making the charset behavior of lambda-express to be more inline with that of express.
lambda-express automatically sets the charset to utf-8 for JSON responses, but does not do so for text responses. Looking at behavior of
sendin express, the charset will be set for string responses (added in expressjs/express#f14e39d4).This issue is to investigate making the charset behavior of lambda-express to be more inline with that of express.