Content-Encoding header is not set properly from rule, only from options

[monrax]

Content-Encoding header is set to deflated instead of identity when skip_compression rule is present as part of options.rules but not options itself. This is not the expected result according to the logger API.

Expected behavior

let logger = new HttpLogger({url: 'http://localhost:7701/message', rules: 'include debug\n\nskip_compression'});
console.log(logger._url_options.headers);
//{
//  'Content-Encoding': 'identity',
//  'Content-Type': 'application/json; charset=UTF-8',
//  'User-Agent': 'Resurface/2.2.1 (http_logger.js)'
//}

Current behavior

let logger = new HttpLogger({url: 'http://localhost:7701/message', rules: 'include debug\n\nskip_compression'});
console.log(logger._url_options.headers);
//{
//  'Content-Encoding': 'deflate',
//  'Content-Type': 'application/json; charset=UTF-8',
//  'User-Agent': 'Resurface/2.2.1 (http_logger.js)'
//}

How to reproduce?

const { HttpLogger } = require('resurfaceio-logger');

let logger = new HttpLogger({url: 'http://localhost:7701/message', rules: 'include debug\n\nskip_compression'});

assert.equal(logger.skip_compression, true);
assert.equal(logger._url_options.headers['Content-Encoding'], 'identity');  // fails

The header can also be inspected with a packet capture tool like wireshark, or an HTTP proxy.

[monrax]

The header is set properly, when passing skip_compression: true as a field to the HttpLogger constructor.
However, then the skip_compression field for the object instance is not set.

const { HttpLogger } = require('resurfaceio-logger');

let logger = new HttpLogger({url: 'http://localhost:7701/message', rules: 'include debug', skip_compression: true});

assert.equal(logger._url_options.headers['Content-Encoding'], 'identity');  // pass!
assert.equal(logger.skip_compression, true); // fail