fix(static, http): set headers right before the serve

[rustatian]

Reason for This PR

closes: #115

Description of Changes

• Set request and response headers for the static files right before the serve.
• Do not reorder the middleware.

No static headers in the regular request

  static:
    dir: "../../../tests"
    forbid: [ "" ]
    allow: [ ".txt", ".php" ]
    calculate_etag: true
    weak: false
    request:
      input: "custom-header"
    response:
      output: "output-header"

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #125 (9269d01) into master (69c14c8) will decrease coverage by 0.04%. The diff coverage is 100.00%.

:exclamation: Current head 9269d01 differs from pull request most recent head 8a84363. Consider uploading reports for the commit 8a84363 to get more accurate results

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   65.39%   65.34%   -0.05%     
==========================================
  Files         135      135              
  Lines       10822    10816       -6     
==========================================
- Hits         7077     7068       -9     
- Misses       3040     3042       +2     
- Partials      705      706       +1     

Impacted Files	Coverage Δ
http/serve.go	71.22% <ø> (+0.18%)	:arrow_up:
http/middleware/static/plugin.go	71.02% <100.00%> (ø)
beanstalk/beanstalkjobs/item.go	77.14% <0.00%> (-2.86%)	:arrow_down:
boltdb/boltjobs/listener.go	61.32% <0.00%> (-2.84%)	:arrow_down:
redis/pubsub/pubsub.go	72.86% <0.00%> (-2.33%)	:arrow_down:
tcp/plugin.go	72.17% <0.00%> (+0.86%)	:arrow_up:
sqs/sqsjobs/item.go	67.10% <0.00%> (+1.31%)	:arrow_up:

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