Fix cache req body

[svilupp]

• Fixed a bug when caching would error for certain types of HTTP body (eg, IOBuffer)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 0.71%. Comparing base (28a5de8) to head (0a331fe).

Files	Patch %	Lines
src/CacheLayer.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #17      +/-   ##
========================================
- Coverage   0.72%   0.71%   -0.01%     
========================================
  Files         15      15              
  Lines        416     417       +1     
========================================
  Hits           3       3              
- Misses       413     414       +1     

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