fix: resolve http non encode attachment filename

[monkeyWie]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 60.68%. Comparing base (bfad91d) to head (2db07bb).

Files with missing lines	Patch %	Lines
internal/protocol/http/fetcher.go	50.00%	6 Missing ⚠️
internal/test/httptest.go	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #975      +/-   ##
==========================================
+ Coverage   60.65%   60.68%   +0.02%     
==========================================
  Files          37       37              
  Lines        4649     4672      +23     
==========================================
+ Hits         2820     2835      +15     
- Misses       1548     1555       +7     
- Partials      281      282       +1     

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