fix basic login demanding json body

[anhqle]

Summary

The server only returns a response with no JSON body, so this method has been returning a JSON decode error

Test Plan

• [ ] PR has an associated issue: #
• [x] make check passes
• [x] make test shows 100% unit test coverage

Deployment Plan

[anhqle]

• #987
• #986 👈
• main

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[anhqle]

Merge activity

• May 8, 8:11 PM EDT: @anhqle merged this pull request with Graphite.