optimize: prebind without content-length

[FGYFFFF]

What type of PR is this?

optimize

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.
• Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo

(Optional) Translate the PR title into Chinese.

优化 prebind 的判断条件

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en:optimize prebind without content-length
zh(optional): 优化 prebind 的判断条件
一些场景下会将 content-length 置为0，导致 prebind 在进行预绑定的时候只根据 content-length 判断会漏掉一些 body

(Optional) Which issue(s) this PR fixes:

#983

(Optional) The PR that updates user documentation:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e02c162) 81.86% compared to head (6e7d8e5) 81.83%.

❗ Current head 6e7d8e5 differs from pull request most recent head 1f11b70. Consider uploading reports for the commit 1f11b70 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #984      +/-   ##
===========================================
- Coverage    81.86%   81.83%   -0.04%     
===========================================
  Files           98       98              
  Lines         9932     9932              
===========================================
- Hits          8131     8128       -3     
- Misses        1311     1314       +3     
  Partials       490      490              

Files	Coverage Δ
pkg/app/server/binding/default.go	82.60% <100.00%> (ø)

... and 1 file with indirect coverage changes

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