Add bodyserializer/accept header to openverse api client to correctly authenticate with the API

[madewithkode]

Add bodyserializer/accept header to openverse api client to correctly authenticate with the API

Fixes

Fixes #5314 by @obulat

Description

The @openverse/api-client package sends the requests for token to the Openverse Django API with the correct parameters but does not serialize the body to the required x-www-form-urlencoded format. This causes the requests to be sent with an empty body. The new changes adds a bodySerializer1 that creates new URLSearchParams from the body object, and stringifies it, thus allowing requests to be sent with correct body objects.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

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[github-actions]

Latest k6 run output¹

     ✓ status was 200

     checks.........................: 100.00% ✓ 398      ✗ 0   
     data_received..................: 96 MB   397 kB/s
     data_sent......................: 52 kB   216 B/s
     http_req_blocked...............: avg=77.46µs  min=2.28µs   med=4.62µs   max=1.43ms   p(90)=155.24µs p(95)=666.74µs
     http_req_connecting............: avg=40.88µs  min=0s       med=0s       max=1ms      p(90)=92.94µs  p(95)=153.61µs
     http_req_duration..............: avg=160.78ms min=19.03ms  med=100.06ms max=1.03s    p(90)=389.23ms p(95)=519.19ms
       { expected_response:true }...: avg=160.78ms min=19.03ms  med=100.06ms max=1.03s    p(90)=389.23ms p(95)=519.19ms
   ✓ http_req_failed................: 0.00%   ✓ 0        ✗ 398 
     http_req_receiving.............: avg=166.23µs min=49.56µs  med=139.72µs max=725.86µs p(90)=277.51µs p(95)=330.41µs
     http_req_sending...............: avg=37.38µs  min=9.61µs   med=22.81µs  max=3.43ms   p(90)=38.88µs  p(95)=65.05µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=160.58ms min=18.91ms  med=99.73ms  max=1.03s    p(90)=389.05ms p(95)=518.95ms
     http_reqs......................: 398     1.653474/s
     iteration_duration.............: avg=849.05ms min=278.32ms med=853.92ms max=1.71s    p(90)=1.17s    p(95)=1.52s   
     iterations.....................: 76      0.315739/s
     vus............................: 0       min=0      max=6 
     vus_max........................: 60      min=60     max=60

Footnotes

1. This comment will automatically update with new output each time k6 runs for this PR ↩

[obulat]

Suggested change

	Accept: "x-www-form-encoded",
	"Content-Type": "x-www-form-encoded",

Sorry, I've mixed up the headers in the issue. The correct one will be content type, to encode the body of the request (and not the response)

[madewithkode]

Skipped this myself, thanks for spotting. Updated now.