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

The _make_handler() method was removed in this PR: aio-libs/aiohttp#3939

But, is still used at: https://github.com/aio-libs/aiohttp/blob/master/tests/autobahn/server.py#L37

This needs updating, if anybody would like to take on this small task.

References to aiohttp.ws_connect() appear to also need updating:
https://github.com/aio-libs/aiohttp/blob/master/tests

建议使用ConcurrentHashMap
eg:private final Map<Class, ObjectParamMetadata> classToMetadata = new ConcurrentHashMap, ObjectParamMetadata>();

此处s是否可

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

JSON Lines is another JSON serialization format that can send a stream of JSON data.
Currently, Armeria only supports JSON Text sequences format using [JsonTextSequences](https://github.com/line/armeria/blob/67c25e242e8604331bdd8696a97d26604eb114af/core/src/main/java/com/linecorp/armeria/server/streaming/JsonTextSequences.java