Fix header processing with enabled validation

[munrojm]

No description provided.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (db7e614) 87.93% compared to head (da8371e) 87.78%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #871      +/-   ##
==========================================
- Coverage   87.93%   87.78%   -0.15%     
==========================================
  Files          44       44              
  Lines        3604     3610       +6     
==========================================
  Hits         3169     3169              
- Misses        435      441       +6     

Files	Coverage Δ
src/maggma/api/resource/s3_url.py	56.00% <0.00%> (-2.34%)	⬇️
src/maggma/api/resource/read_resource.py	82.56% <0.00%> (-3.15%)	⬇️

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