Express 相关

Relate to https://stackoverflow.com/a/7086621

Comprehensive list of Node.js/Express response methods and when they must be called:

Response must be in Head and remains in Head:

1. res.writeContinue()
2. res.statusCode = 404
3. res.setHeader(name, value)
4. res.getHeader(name)
5. res.removeHeader(name)
6. res.header(key[, val]) (Express only)
7. res.charset = 'utf-8' (Express only; only affects Express-specific methods)
8. res.contentType(type) (Express only)

Response must be in Head and becomes Body:

1. res.writeHead(statusCode, [reasonPhrase], [headers])

Response can be in either Head/Body and remains in Body:

1. res.write(chunk, encoding='utf8')

Response can be in either Head/Body and becomes Finished:

1. res.end([data], [encoding])

Response can be in either Head/Body and remains in its current state:

1. res.addTrailers(headers)

Response must be in Head and becomes Finished:

1. return next([err]) (Connect/Express only)
2. Any exceptions within middleware function(req, res, next) (Connect/Express only)
3. res.send(body|status[, headers|status[, status]]) (Express only)
4. res.attachment(filename) (Express only)
5. res.sendfile(path[, options[, callback]]) (Express only)
6. res.json(obj[, headers|status[, status]]) (Express only)
7. res.redirect(url[, status]) (Express only)
8. res.cookie(name, val[, options]) (Express only)
9. res.clearCookie(name[, options]) (Express only)
10. res.render(view[, options[, fn]]) (Express only)
11. res.partial(view[, options]) (Express only)