fix(http handler): base64 response instead of json

[rustatian]

Reason for This PR

closes: #86

Description of Changes

• Clear all fields of the req before putting it to the sync.Pool

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 #88 (c25b382) into master (c603f5b) will decrease coverage by 0.42%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   69.10%   68.67%   -0.43%     
==========================================
  Files         118      119       +1     
  Lines        9969     9993      +24     
==========================================
- Hits         6889     6863      -26     
- Misses       2408     2459      +51     
+ Partials      672      671       -1     

Impacted Files	Coverage Δ
beanstalk/beanstalkjobs/config.go	68.42% <ø> (ø)
beanstalk/beanstalkjobs/connection.go	63.15% <ø> (ø)
beanstalk/beanstalkjobs/consumer.go	75.43% <ø> (ø)
beanstalk/beanstalkjobs/item.go	80.00% <ø> (ø)
beanstalk/beanstalkjobs/listen.go	78.26% <ø> (ø)
http/handler/request.go	77.21% <57.14%> (-0.42%)	:arrow_down:
beanstalk/plugin.go	93.33% <100.00%> (ø)
http/handler/handler.go	82.66% <100.00%> (+0.07%)	:arrow_up:
sqs/sqsjobs/consumer.go	76.66% <100.00%> (+0.07%)	:arrow_up:
jobs/listener.go	35.15% <0.00%> (-12.50%)	:arrow_down:
... and 9 more

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