Is your feature request related to a problem? Please describe.

I try to execute my first GET request and get this result:

I think the first-time-user experience could get improved here.

The hint to F12 vanishes soon, and I think accessing the error message via F12 is not a

Describe the bug

Originally, @asvetlov intended to delete any use of attrs from aiohttp 4.0+ series via aio-libs/aiohttp#5284. He dropped it from the runtime deps too.

But there are some places that still rely on attrs meaning that this will cause failures in runtime because of the missing dep. The tests currently succeed because attrs is listed as a test dep.

Got has a very good coverage test-wise. Would be nice to port relevant tests that we're missing over to Ky.

Note: Not for https://github.com/sindresorhus/ky/blob/master/test/browser.js, but for everything else.

From time to time i see ppl using data instead of body which is wrong.
happened just recently in node-fetch/node-fetch#481 (comment)

how do you feel about adding a little warning message that can only appear once. (kinda like node reports that you are using experimental apis)

if ('data' in bodyInit && notWarned) {
  console.warn('use body i

When writing a test case with ServerRule or ServerExtension, a user sometimes wants to capture the ServiceRequestContexts:

class MyJUnit5Test {
  static final var serviceContexts =
      new LinkedBlockingQueue<ServiceRequestContext>();

  @RegisterExtension
  static final var server = new ServerExtension() {
    @Override
    protected void configure(ServerBuilder sb) thr