Refactor file body

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[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[codecov]

Codecov Report

❌ Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.50%. Comparing base (d90cfcf) to head (a29e2af).
⚠️ Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/file_sink.cpp	91.66%	1 Missing ⚠️
src/file_source.cpp	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #151      +/-   ##
===========================================
+ Coverage    91.93%   92.50%   +0.57%     
===========================================
  Files           76       79       +3     
  Lines         4974     4993      +19     
===========================================
+ Hits          4573     4619      +46     
+ Misses         401      374      -27     

Files with missing lines	Coverage Δ
include/boost/http_proto/detail/file_posix.hpp	100.00% <100.00%> (ø)
include/boost/http_proto/detail/file_stdio.hpp	100.00% <100.00%> (ø)
include/boost/http_proto/file.hpp	100.00% <100.00%> (ø)
include/boost/http_proto/rfc/detail/ws.hpp	100.00% <100.00%> (ø)
include/boost/http_proto/rfc/impl/list_rule.hpp	98.24% <ø> (ø)
include/boost/http_proto/rfc/list_rule.hpp	100.00% <ø> (ø)
src/detail/file_posix.cpp	84.76% <ø> (ø)
src/detail/file_stdio.cpp	84.92% <ø> (ø)
src/detail/header.cpp	92.79% <ø> (ø)
src/fields_base.cpp	94.87% <ø> (ø)
... and 6 more

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[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://151.http-proto.prtest.cppalliance.org/index.html