DNS Resolution

Demonstrates DNS helpers: IP address detection, host:port parsing, hostname resolution, and TTL-based DNS caching.

Demo Program

// Check if a string is an IP address
httpx.isIpAddress("127.0.0.1");       // true
httpx.isIp4Address("example.com");    // false
httpx.isIp6Address("::1");            // true

// Parse "host:port" strings
const parsed = httpx.parseHostAndPort("127.0.0.1:8080", 0);

// Resolve a single address
const address = httpx.resolveAddress(allocator, "127.0.0.1", 80);

// Resolve all candidate addresses
const all_addrs = httpx.resolveAllAddresses(allocator, "127.0.0.1", 443);

// DNS cache with TTL-based expiration
var cache = httpx.dns.DnsCache.init(allocator);
const cached = try cache.resolve("127.0.0.1", 80);

Run

zig build example-dns

Checklist

• [x] isIpAddress correctly identifies IPv4, IPv6, and hostnames
• [x] parseHostAndPort splits "host:port" and "[::1]:port" correctly
• [x] resolveAddress returns a single Address
• [x] resolveAllAddresses returns all candidate addresses
• [x] DnsCache returns the same result on repeated lookups
• [x] Convenience function summary prints at the end