[merge 12/8/25] default MaxConnsPerHost to 2048 (#3245)

Author: lucix-aws

.changelog/e8481985f9794c4082447339c1d71a63.json

@@ -0,0 +1,8 @@
+{
+ "id": "e8481985-f979-4c40-8244-7339c1d71a63",
+ "type": "feature",
+ "description": "The default value of MaxConnsPerHost in HTTP clients created by the SDK is now 2048, down from unlimited. See #3243.",
+ "modules": [
+ "."
+ ]
+}

aws/transport/http/client.go

@@ -18,6 +18,7 @@ var (
 // Default connection pool options
 DefaultHTTPTransportMaxIdleConns = 100
 DefaultHTTPTransportMaxIdleConnsPerHost = 10
+DefaultHTTPTransportMaxConnsPerHost = 2048
 
 // Default connection timeouts
 DefaultHTTPTransportIdleConnTimeout = 90 * time.Second
@@ -186,6 +187,7 @@ func defaultHTTPTransport() *http.Transport {
 TLSHandshakeTimeout: DefaultHTTPTransportTLSHandleshakeTimeout,
 MaxIdleConns: DefaultHTTPTransportMaxIdleConns,
 MaxIdleConnsPerHost: DefaultHTTPTransportMaxIdleConnsPerHost,
+MaxConnsPerHost: DefaultHTTPTransportMaxConnsPerHost,
 IdleConnTimeout: DefaultHTTPTransportIdleConnTimeout,
 ExpectContinueTimeout: DefaultHTTPTransportExpectContinueTimeout,
 ForceAttemptHTTP2: true,