fix content type

[nobodyiam]

No description provided.

[codecov-io]

Codecov Report

Merging #1443 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1443      +/-   ##
============================================
- Coverage     48.47%   48.45%   -0.02%     
+ Complexity     1802     1800       -2     
============================================
  Files           379      379              
  Lines         10928    10928              
  Branches       1121     1121              
============================================
- Hits           5297     5295       -2     
  Misses         5244     5244              
- Partials        387      389       +2

Impacted Files	Coverage Δ	Complexity Δ
...ervice/service/ReleaseMessageServiceWithCache.java	85.71% <0%> (-1.2%)	24% <0%> (-1%)
...lo/configservice/util/InstanceConfigAuditUtil.java	70.17% <0%> (-0.88%)	13% <0%> (-1%)

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[coveralls]

Coverage remained the same at 52.013% when pulling cc80b75 on nobodyiam:fix-content-type into 0950681 on ctripcorp:master.