Better HTTP/1 connection reuse in Go 1.27

Go 1.27 achieves nearly 5x faster performance for repeated HTTP requests compared to Go 1.26 by improving HTTP/1 connection reuse. The dramatic improvement stems from better handling of connection pooling, which eliminates the costly overhead of repeatedly establishing new TCP and TLS connections—a process that can take 3+ round-trip times. The enhancement allows Go applications to reuse existing connections more efficiently, significantly reducing latency for workloads making multiple HTTP requests.