If the website containing the Smart API Manager application has certain HTTP verbs disabled, many features in the Smart API Manager application might fail to work.
You can see which HTTP verbs are configured for a website by double-clicking the Request Filtering feature in IIS Manager, and then clicking the HTTP Verbs tab.
The default configuration (no HTTP verbs in the list) should always work.
Smart API Manager requires the following HTTP verbs to be enabled:
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GET
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POST
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PUT
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PATCH
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DELETE