HTTPDNS:Asynchronously resolve domain names to IPv6 addresses

If you use HTTPDNS in an IPv6-only network environment, take note of the following points:

• When you use IP address URLs to make network requests, the formats of IPv4 addresses and IPv6 addresses are different.

  • IPv4: http://1.1.1.1/path

  • IPv6: http://[2001:db8:c000:221::]/path

  As shown in the preceding example, enclose an IPv6 address with brackets in a URL.

  For the convenience of developers, HTTPDNS provides the following IP acquisition operation that adapts to different URL formats: -[HTTPDNS Service getIpByHostAsyncInURLFormat:].

• When you obtain an IP address by using HTTPDNS and use the IP address to access a URL-based network, you can call the preceding operation to obtain the formatted IP address that complies with the scenario-specific URL, such as *1.1.1.1* and *[2001:db8:c000:221::]*.

  If you only want to get accurate IP address information for something else, you can continue to call the old operation: -[HttpDnsService getIpByHostAsync:].