I have a post request that when sent in python through the requests or aiohttp library, responds as expected, but when the equivalent request is sent in rust through the reqwest library, is pure gibberish.

The request:

pub async fn get_token(client: &reqwest::Client, uri: String, headers: HeaderMap, body: serde_json::json) {

  let user_name = env::var("USERNAME").unwrap();
  let password =env::var("PWD").unwrap();
  let resp = client.post(uri).headers(headers).json(body).send().await;
  if resp.is_ok() {
    println!("{}", resp.text().await.unwrap())
  }

Expected body of response:

{"access_token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiJ3aGhjaFFTRWF6Y2s1RmI5VyIsInJvbGVzIjp7Imdsb2JhbCI6WyJkcml2ZXIiXSwiZ3JvdXBzIjpbXX0sInNjb3BlIjpbImxvZ2luIl0sImlhdCI6MTY0ODYyNDkwOCwiZXhwIjoxNjQ4NjI4NTA4fQ.EQrLoG9cDQTXcbqBPZdfhN0cjOXRCeGz_cA8uTNF9kN4_rIVV4xcb67OwT8I03ch49V-BeA71qvbVDYdVqubNg5jxA6iSeTng-6aepGswyIaWYuDHx8KFUdaRWoZVh-WhIlDNSNIXkFbxnO4ggKy_Bf3nVJbIraWuitWWVcwjg8jbOy4cpjSkIjgiXUzMNL8_RWOIATvthplnw4MBsOpEsBsZkoYqfOjMmepojyGPE-FjrLYTWFZpB0PHV3OSv3mwZT-aAtI2yexZOSi6rz2TuBhPJVk93SfcXq-UeUPIlSrN7C6QI-6jVIzl9xFX1DKO0Uc8Fq3M-lvPnYkmY29G09h6Ltr9XPBRq9AZq-_r7yAH1lsWvWf1XhTwEOsFcACkH5Q5HxA4Ai50PegrHEhcBB9Cub9CPySMJ9oIewfj3cQURbRHAALbGXpiHBE7BU39QLUskuyzL4OGShaHliHQk1igyPRRHMdYeCGb1P39wB_Mq3nUzoH047QQ7KMGHb5azMPTLav7FsVmJhw7NOGIZtIyILz_07IcA_4XriokJuKUjBBOHuz82Ka7Vi6kthPsnDPplZ3i7TgQi8IptOWpm7IbhPAhTaSH5DuXFQfmtkWVNMcoVR6_Q8O1DNw9DVQmQwEycOA4SbbSYKmdVz0K8w81Kk7HGR6MGln4hEbrSk",
"refresh_token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiJ3aGhjaFFTRWF6Y2s1RmI5VyIsInNjb3BlIjpbInJlZnJlc2giXSwiaWF0IjoxNjQ4NjI0OTA4fQ.LDfwWeDPG11ZHNRo1Tks4LFY399VRKLI_cQnrxbGVAwlfCftOnIWw5-bsjXxMgnT6psL6D9EdKzBN8BNrw0eCis4U7EjVNUkGFegCmjPlO8gmdc_MRaHO-gN2TN43C-2jwbA9IojOw7UqVUtEzwp4px-OqnYNNIxqMnFOa5oe72v2ILJ5G3bD0J-0AQ-ly-Ce_lstDhObG-yVptIRcbt54OJ1Ou9PjPi9Y0OuVo6rwpQ1KKXdNc4GbQ_cOQKpQ6CJkDK-SjYByOFXC1pqD3aku4lxHpfx99K3RWFgmSeIN4VQLcQ7uBEWvBePEWUCEXSGiod1hK-gLAY0c-Io6NEygZWKIlACKoEphZLqyoKQ7vn-iMlN-8DGWX8Oh6gfT7ULhiG4U_JUheXxIzFvQBLfKtmXbKyagYEZ-y-Zl2nkAEZG2QzSm-cRAsTgquOvJvfujAtK3c5dHKoBL-0jIfnfWr4BHsptsWCc5J2SGtjjtTIG-Lh9d5mqgfN8TBVEK2R1JIeF0HxYPXcOO9CZZmqGqWp5YNZCJwppP2VJoVLSyzi3X5Cu0WWv7OpImmiR8H_M1JAn4XMyPMtyKFM5seewn8s6bOsZzELkKaPAFWbLlgeoJlDGA0CZtwFs2iJdd-UbS5C2dXUQw7yxVhRUIUq-pC1F3NVo51bRHgGzpcSYlE",
"token_type":"bearer",
"expires_in":3600}

The actual response:

�lMP�JX@z�ܦ}��>�}�CL>2�y@3%��`P�c:�L    �#D�t�
���X@*vk\p�\�*�Y�~u�f������J<����|}b    �M?^*&�d-u����2�!�hKU�1�`�dit�
�5W#�͛�Z1;F5��w�+��1.� DY#
���x?u]�äh(F��c�#���ů��Y{I�3XU�QN�+�pu�=��-X���+�5('�b9�бGz���l4��}����=Ȫ��FQm�����͂-��wiD� p�%S�>yq����d��/N�c2g���˛����kɋ%_�h5���9�]8�]���o�u�    � `u�~R�o7_9��S��C��%LPj^��#����}{B�� "�_}�IGb��p�:9Bۤ7�ٌT�_|cJDْ��Q�l��2@S��Rܣ\۳�}T�C+꽨ʹ�O����ƝW�����=�`th�忿��&dU��zh�I��X��_�1���oο��Vdp�������P�#���E�
ǣ��3�L��x�¡�?�~������Z��Bk���
(��$h`0�r���$wr��W꜄է��c
���7�0�E-�b��I6Q�ac���V�
��F��7���o�ݭ9�4��j<�a�/L��&dUZ��8����Åba!�X��.�������`ˣ�'A'���/sP,�m�?~v/�綔FR��|
]��l1�}\(]��̃�'㠊җ�)�
��EG2#�4�H�gd�x��p�������JՏ���+ϼ�m#��o=���)j=��\�}���pB<Tb×r��N���K�q��){+��u�HK�,Pu�+��絍m>D�=��$��|y�y��T/����F���

The issue is seems to obviously be some kind of format or encoding/decoding issue, but I can't find anything relevant to something like this. Anyone have an idea what the issue is?

EDIT

So I ended up being able to figure out what the issue was, and it was in the Accept-Encoding request header, whose value was gzip, deflate, br

I was trying to see if any of my configured request headers were the issue by just removing them one by one, and that header was certainly the issue.

The response headers now have the Vary header set to Accept-Encoding, so I'm not even sure what the actual compression mechanism is being used to produce the correct response.

Can anyone offer an explanation on why the gzip, deflate, br header when used in the python request would respond as expected while the rust request would not?