fix issue 555 about request header context-length missing

[suchen-sci]

Golang http.NewRequestWithContext will set http.Request.ContentLength when body is bytes.Buffer, bytes.Reader or strings.Reader. If http.Request.ContentLength is not send, Golang std lib will delete Header of Context-Length when sending request. Fix #555

[codecov-commenter]

Codecov Report

Merging #649 (eb2c4d5) into main (2aa4404) will decrease coverage by 0.12%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #649      +/-   ##
==========================================
- Coverage   80.12%   80.00%   -0.13%     
==========================================
  Files          95       95              
  Lines       10981    10986       +5     
==========================================
- Hits         8799     8789      -10     
- Misses       1705     1715      +10     
- Partials      477      482       +5     

Impacted Files	Coverage Δ
pkg/filter/proxy/proxy.go	82.40% <ø> (ø)
pkg/filter/proxy/request.go	92.95% <0.00%> (-7.05%)	⬇️
pkg/cluster/cluster.go	59.00% <0.00%> (-1.87%)	⬇️
pkg/object/mqttproxy/client.go	80.54% <0.00%> (+0.90%)	⬆️

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[suchen-sci]

updated!