`/api/v2/subawards/` does not respect Content-Type header

[Ech0riginal]

The/api/v2/subawards/ route does not respect the Content-Type header. It will only accept requests with a content type header of application/x-www-form-urlencoded, regardless of the actual content. Disregarding this header will result in a default empty value akin to:
{"page_metadata":{"page":1,"next":null,"previous":1,"hasNext":false,"hasPrevious":true},"results":[]}

To be clear: if you do not use this header while maintaining the interface detailed in api_contracts/contracts/v2/subawards.md the request is seemingly rejected outright.

Example using the incorrect header:

curl 'https://api.usaspending.gov/api/v2/subawards/' \
  -X POST \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -d '{ 
        "page": 1,
        "limit": 10,
        "sort": "subaward_number",
        "order": "asc",
        "award_id": "W56KGU21C0050"
      }'

Returns:

{
  "page_metadata": {
    "page": 1,
    "next": 2,
    "previous": null,
    "hasNext": true,
    "hasPrevious": false
  },
  "results": [
    {
      "id": 148401622,
      "subaward_number": "\u00a0\u00a0DLPH050233",
      "description": "PAINT ABATEMENT \u00a0LABOR",
      "action_date": "2017-04-20",
      "amount": 52260.0,
      "recipient_name": "IMIA, LLC"
    },
    {
      "id": 154994152,
      "subaward_number": "\u00a0MAKSPH-001-18",
      "description": "SUPPORTED THE SCALING OFF-GRID ENERGY (SOGE) OFF-GRID SOLAR HOME SYSTEMS AND STORAGE TECHNOLOGY MARKET ASSESSMENTS",
      "action_date": "2018-06-01",
      "amount": 72025.0,
      "recipient_name": "REGENTS OF THE UNIVERSITY OF CALIFORNIA, THE"
    },
    {
      "id": 148595490,
      "subaward_number": "\u00a0DLPH050607",
      "description": "SCAFFFOLDING",
      "action_date": "2017-05-09",
      "amount": 32493.0,
      "recipient_name": "TURN KEY SCAFFOLD LLC"
    },
    {
      "id": 149488398,
      "subaward_number": "\u00a0DLPH050232",
      "description": "CONTROLS ENGINEER - LABOR",
      "action_date": "2017-04-17",
      "amount": 49035.2,
      "recipient_name": "AEROTEK AFFILIATED SERVICES, INC."
    },
    {
      "id": 152602401,
      "subaward_number": "\u00a0ASUB00000454",
      "description": "PREPARING RESEARCHERS IN EARLY INTERVENTION FOR CHILDREN WITH DISABILITIES FROM MULTICULTURAL ENVIRONMENTS",
      "action_date": "2020-01-14",
      "amount": 234778.0,
      "recipient_name": "UNIVERSITY OF ARIZONA"
    },
    {
      "id": 149918994,
      "subaward_number": "ZZEMSP02",
      "description": "TO PROVIDE FINANCIAL ASSISTANCE IN MEETING THE TRANSPORTATION NEEDS OF SENIORS AND INDIVIDUALS WITH DISABILITIES WHERE PUBLIC TRANSPORTATION SERVICES ARE UNAVAILABLE, INSUFFICIENT OR INAPPROPRIATE. THE SECTION 5310 PROGRAM IS DESIGNED TO SUPPLEMENT FTA'S OTHER CAPITAL ASSISTANCE PROGRAMS BY FUNDING TRANSPORTATION PROJECTS FOR SENIORS AND INDIVIDUALS WITH DISABILITIES IN ALL AREAS - URBANIZED, SMALL URBAN, AND RURAL. THE PROGRAM INCLUDES NEW FREEDOM PROGRAM ACTIVITIES AS ELIGIBLE PROJECTS.",
      "action_date": "2021-09-23",
      "amount": 54115.0,
      "recipient_name": "EAST TENNESSEE HUMAN RESOURCE AGENCY, INC."
    },
    {
      "id": 151427852,
      "subaward_number": "ZZ8-K45",
      "description": "SUPPORT THE OBJECTIVES AND DELIVERABLES OF DE-FE0032131. THE FRONT END ENGINEERING DESIGN STUDY AND PUBLIC POLICY CONSIDERATIONS",
      "action_date": "2022-02-11",
      "amount": 228913.0,
      "recipient_name": "SOUTHERN COMPANY SERVICES, INC."
    },
    {
      "id": 150144222,
      "subaward_number": "ZZ-42-580",
      "description": "CAREER AND TECHNICAL EDUCATION -- BASIC GRANTS",
      "action_date": "2012-07-01",
      "amount": 19245.0,
      "recipient_name": "MARION COUNTY SCHOOL DISTRICT"
    },
    {
      "id": 150236946,
      "subaward_number": "ZZ2THS144",
      "description": "ENFORCEMENT OF TN DUI LAWS",
      "action_date": "2022-01-14",
      "amount": 36600.0,
      "recipient_name": "CITY OF JOHNSON CITY"
    },
    {
      "id": 150029039,
      "subaward_number": "ZZ2THS005",
      "description": "CHOICES MATTER",
      "action_date": "2021-12-29",
      "amount": 50000.0,
      "recipient_name": "ALLIANCE SPORT MARKETING LLC"
    }
  ]
}

Example using the correct header:

curl 'https://api.usaspending.gov/api/v2/subawards/' \
  -X POST \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{ 
        "page": 1,
        "limit": 10,
        "sort": "subaward_number",
        "order": "asc",
        "award_id": "W56KGU21C0050"
      }'

Returns:

{
  "page_metadata": {
    "page": 1,
    "next": null,
    "previous": null,
    "hasNext": false,
    "hasPrevious": false
  },
  "results": []
}