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Services_JSON::encode

encodes an arbitrary variable into JSON format (and sends JSON Header)

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WP_Http::is_ip_address

Determines if a specified string represents an IP address or not.

WP_Http::make_absolute_url

Converts a relative URL to an absolute URL relative to a given URL.

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WP_Http::parse_url

Used as a wrapper for PHP’s parse_url() function that handles edgecases in < PHP 5.4.7.

WP_Http::block_request

Determines whether an HTTP API request to the given URL should be blocked.

WP_Http::buildCookieHeader

Takes the arguments for a ::request() and checks for the cookie array.

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WP_Http::head

Uses the HEAD HTTP method.