Generic error messages from API response

[DJTommek]

Which version are you using?

New behavior: current master (revision e4fdf5f)
Old behavior: revision 3436f3b
PHP version doesn't matter, tested with 7.2.33, 7.3.21, 7.4.9 and 8.0.9

Description of problem

It seems, that after PR #127 which migrates reactphp, there is no longer access to real error message from Telegram, but generic HTTP 400 error is returned instead.

Steps to reproduce incorrect behavior:

1. clone repo and open terminal in cloned folder
2. run composer install
3. update BOT_TOKEN constant in examples/conf.php
4. run php examples/get-chat-members-count.php

Description of error message: "HTTP status code 400 (Bad Request)"

Steps to reproduce old correct behavior:

1. clone repo but checkout to 3436f3b revision (just before Migrate reactphp/http-client to reactphp/client #127), then continue as usually

Description of error message: "Bad Request: chat not found"

Added attachments of Tracy logging which is interactive, so you can check all parameters across call stack or environment.

• exception-new.txt
• exception-old.txt

Because Github is not allowing updating HTML files, I uploaded them as .txt. Just rename them as .html and open in browser.

ping @Yoshi2889