[BUGFIX fetch] prevent Accept & ContentType header overwriting (#6062)#6075

Merged

rwjblue merged 1 commit intobetafrom backport/beta-pr6062

May 1, 2019

+39-2

Commits on May 1, 2019

[BUGFIX fetch] prevent Accept & ContentType header overwriting (#6062 )

nikhilsane
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