Suppress binary output on the command line.

[waterfountain1996]

Closes #2049

Changed print_response to simply display the content length of a binary response.

get_lexer_for_response returns 'Text only' for a Content-Type: text/... response, so it will be properly displayed using rich.syntax.Syntax. Those responses which do not get a corresponding lexer are considered binary and their output is suppressed.

To make the tests pass I had to add another route to the test server that would return a binary response. Feel free to point it out if there's another way to do it.

[tomchristie]

Great - thanks!

[tomchristie]

Verified this to myself with the following...

# Nice clean virtualenv. Be explicit about which version of Python.
$ python3.9 -m venv venv

# Install from the `binary-output` branch on your repo.
$ venv/bin/pip install git+https://github.com/waterfountain1996/httpx.git@binary-output

# Also pull in the optional dependancies. Not sure I can do that with the URL style above?
$ venv/bin/pip install httpx[cli]

# Run it and check...
$ venv/bin/httpx https://cataas.com/cat
HTTP/1.1 200 OK
Server: nginx/1.12.2
Date: Wed, 09 Feb 2022 15:33:14 GMT
Content-Type: image/jpeg
Content-Length: 35069
Connection: keep-alive
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: X-Requested-With, Content-Type, Accept, Origin, Authorization
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Cache-Control: public, max-age=30
ETag: 1644379259564

<35069 bytes of binary data>

[tomchristie]

Ah here we go... pypa/pip#6548

Using the following would install from your branch, and include the optional dependancies.

$ venv/bin/pip install "httpx[cli] @ git+https://github.com/waterfountain1996/httpx.git@binary-output"