Compatible with mock server

[taohe1012]

SUMMARY

Compatible with mock server's http protocol

Relates OR Closes #0000

ISSUE TYPE

• Bugfix Pull Request
• Docs Pull Request
• Feature Pull Request
• New Module Pull Request

COMPONENT NAME

ADDITIONAL INFORMATION

Release note for CHANGELOG:

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

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[terraform-providers-svc]

Can one of the admins verify this patch?