Multiple response headers with same name combined to a single comma-separated list

[stuartio]

Checklist

• [x] I've searched for similar issues.
• [x] I'm using the latest version of HTTPie.

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Minimal reproduction code and steps

1. Request from any endpoint which produces multiple response headers with the same name

Current result

HTTP/1.1 200 OK Connection: keep-alive Content-Length: 2 Content-Type: text/plain Date: Mon, 13 Jun 2022 11:17:01 GMT Server: nginx/1.22.0 edge-cache-tag: origin.stuartmacleod.net-2022-06-13T11-17-01.933Z not-edge-cache-tag: origin.stuartmacleod.net-2022-06-13T11-17-01.933Z testheader: 1, 2, 3

Expected result

HTTP/1.1 200 OK Connection: keep-alive Content-Length: 2 Content-Type: text/plain Date: Mon, 13 Jun 2022 11:17:01 GMT Server: nginx/1.22.0 edge-cache-tag: origin.stuartmacleod.net-2022-06-13T11-17-01.933Z not-edge-cache-tag: origin.stuartmacleod.net-2022-06-13T11-17-01.933Z testheader: 1 testheader: 2 testheader: 3

Debug output

PS C:\code> http https://origin.stuartmacleod.net/httpie --debug HTTPie 3.2.1 Requests 2.27.1 Pygments 2.11.2 Python 3.8.10 (tags/v3.8.10:3d8993a, May 3 2021, 11:48:03) [MSC v.1928 64 bit (AMD64)] C:\code\Python\Python38\python.exe Windows 10

<Environment {'apply_warnings_filter': <function Environment.apply_warnings_filter at 0x000001EC361D6310>, 'args': Namespace(), 'as_silent': <function Environment.as_silent at 0x000001EC361D61F0>, 'colors': 256, 'config': {'default_options': ['--style=xcode']}, 'config_dir': WindowsPath('C:/Users/Stuart/AppData/Roaming/httpie'), 'devnull': <property object at 0x000001EC3616B4A0>, 'is_windows': True, 'log_error': <function Environment.log_error at 0x000001EC361D6280>, 'program_name': 'http', 'quiet': 0, 'rich_console': <functools.cached_property object at 0x000001EC36168E20>, 'rich_error_console': <functools.cached_property object at 0x000001EC361764C0>, 'show_displays': True, 'stderr': <colorama.ansitowin32.StreamWrapper object at 0x000001EC36148E50>, 'stderr_isatty': True, 'stdin': <_io.TextIOWrapper name='' mode='r' encoding='utf-8'>, 'stdin_encoding': 'utf-8', 'stdin_isatty': True, 'stdout': <colorama.ansitowin32.StreamWrapper object at 0x000001EC3612FFA0>, 'stdout_encoding': 'utf-8', 'stdout_isatty': True}>

<PluginManager {'adapters': [], 'auth': [<class 'httpie.plugins.builtin.BasicAuthPlugin'>, <class 'httpie.plugins.builtin.DigestAuthPlugin'>, <class 'httpie.plugins.builtin.BearerAuthPlugin'>], 'converters': [], 'formatters': [<class 'httpie.output.formatters.headers.HeadersFormatter'>, <class 'httpie.output.formatters.json.JSONFormatter'>, <class 'httpie.output.formatters.xml.XMLFormatter'>, <class 'httpie.output.formatters.colors.ColorFormatter'>]}>

requests.request(**{'auth': None, 'data': RequestJSONDataDict(), 'headers': <HTTPHeadersDict('User-Agent': b'HTTPie/3.2.1')>, 'method': 'get', 'params': <generator object MultiValueOrderedDict.items at 0x000001EC36543200>, 'url': 'https://origin.stuartmacleod.net/httpie'})

HTTP/1.1 200 OK Connection: keep-alive Content-Length: 2 Content-Type: text/plain Date: Mon, 13 Jun 2022 11:18:15 GMT Server: nginx/1.22.0 edge-cache-tag: origin.stuartmacleod.net-2022-06-13T11-18-15.040Z not-edge-cache-tag: origin.stuartmacleod.net-2022-06-13T11-18-15.040Z testheader: 1, 2, 3

ok

Additional information, screenshots, or code examples

This behaviour was changed after version 2.4.0. With 2.4.0 and earlier it outputs as expected, so I assume this was a deliberate move. If so, is there an option to use the previous output behaviour I could add to my config.json?