fix(volo-http): wait for HTTP/1 readiness to enable connection reuse

[junliurs]

Motivation

Solution

[codecov]

Codecov Report

❌ Patch coverage is 38.88889% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.92%. Comparing base (43dd124) to head (6c39115).

Files with missing lines	Patch %	Lines
volo-http/src/client/transport/protocol.rs	38.88%	11 Missing ⚠️

❌ Your patch check has failed because the patch coverage (38.88%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #661      +/-   ##
==========================================
- Coverage   46.93%   46.92%   -0.02%     
==========================================
  Files         163      163              
  Lines       20454    20472      +18     
==========================================
+ Hits         9600     9606       +6     
- Misses      10854    10866      +12     

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