chore: read response headers into a 64KiB buffer instead of 4KiB

internal/sarin/client.go

@@ -61,6 +61,7 @@ func NewHostClients(
 				ReadTimeout:                   timeout,
 				MaxResponseBodySize:           safeUint64ToInt(maxResponseBody),
 				MaxIdemponentCallAttempts:     1,
+				ReadBufferSize:                64 << 10, // 64 KiB
 				DisableHeaderNamesNormalizing: true,
 				DisablePathNormalizing:        true,
 				NoDefaultUserAgentHeader:      true,
@@ -85,6 +86,7 @@ func NewHostClients(
 		ReadTimeout:                   timeout,
 		MaxResponseBodySize:           safeUint64ToInt(maxResponseBody),
 		MaxIdemponentCallAttempts:     1,
+		ReadBufferSize:                64 << 10, // 64 KiB
 		DisableHeaderNamesNormalizing: true,
 		DisablePathNormalizing:        true,
 		NoDefaultUserAgentHeader:      true,

internal/sarin/scripthttp.go

@@ -56,11 +56,11 @@ func newScriptHTTPClient(
 		// Read and write timeouts stay unset because they would cap the per-call timeout,
 		// so dialWithDeadline is what bounds the TLS handshake.
 		return &fasthttp.Client{
-			DialTimeout:         dialWithDeadline(dial),
-			MaxConnsPerHost:     safeUintToInt(maxConns),
-			MaxResponseBodySize: safeUint64ToInt(maxResponseBody),
-			// Retries would send one script call several times and hide it from the results.
+			DialTimeout:               dialWithDeadline(dial),
+			MaxConnsPerHost:           safeUintToInt(maxConns),
+			MaxResponseBodySize:       safeUint64ToInt(maxResponseBody),
 			MaxIdemponentCallAttempts: 1,
+			ReadBufferSize:            64 << 10, // 64 KiB
 			TLSConfig: &tls.Config{
 				InsecureSkipVerify: insecure, //nolint:gosec
 			},