diff --git a/config.go b/config.go
index ba4ef61..d659344 100644
--- a/config.go
+++ b/config.go
@@ -40,9 +40,12 @@ func GzipConfig(level int, h func(gw *gzip.Writer) error) Config {
 // Deprecated: Use reqtest.Server.
 func TestServerConfig(s *httptest.Server) Config {
 	return func(rb *Builder) {
+		// In memory servers don't set s.URL until after s.Client is called,
+		// so call that first.
+		cl := s.Client()
 		rb.
 			BaseURL(s.URL).
-			Client(s.Client())
+			Client(cl)
 	}
 }
 
diff --git a/config_example_test.go b/config_example_test.go
index f35c6dc..63d80e6 100644
--- a/config_example_test.go
+++ b/config_example_test.go
@@ -13,6 +13,7 @@ import (
 	"strings"
 
 	"github.com/carlmjohnson/requests"
+	"github.com/carlmjohnson/requests/reqtest"
 )
 
 func ExampleNew() {
@@ -52,6 +53,7 @@ func ExampleGzipConfig() {
 				_, err := gw.Write([]byte(`hello, world`))
 				return err
 			})).
+		Transport(reqtest.ReplayFile("testdata/postman-echo POST gzip pL_wuhOy.res.txt")).
 		ToJSON(&echo).
 		Fetch(context.Background())
 	if err != nil {
diff --git a/go.mod b/go.mod
index 0433859..090cb4a 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/carlmjohnson/requests
 
 go 1.25.0
 
-require golang.org/x/net v0.55.0
+require golang.org/x/net v0.58.0
diff --git a/go.sum b/go.sum
index 9354ef5..0a44e17 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-golang.org/x/net v0.55.0 h1:bcvxaJn3e1U6InsFWt1JUq1aSjnRxLzT2rtD2KfkDF8=
-golang.org/x/net v0.55.0/go.mod h1:L5U2KuzuOe1lY7Z+aWVIKK6qEeJXnXV9yzGA+WCHJww=
+golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
+golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
diff --git a/reqtest/transport.go b/reqtest/transport.go
index cfdefea..e1bc0c7 100644
--- a/reqtest/transport.go
+++ b/reqtest/transport.go
@@ -1,8 +1,11 @@
 package reqtest
 
 import (
+	"bufio"
+	"bytes"
 	"io/fs"
 	"net/http"
+	"os"
 
 	"github.com/carlmjohnson/requests"
 )
@@ -29,6 +32,19 @@ func Replay(basepath string) requests.Transport {
 	return requests.Replay(basepath)
 }
 
+// ReplayFile returns an http.RoundTripper that reads its
+// response from the response file at path.
+func ReplayFile(path string) requests.Transport {
+	return requests.RoundTripFunc(func(req *http.Request) (res *http.Response, err error) {
+		b, err := os.ReadFile(path)
+		if err != nil {
+			return nil, err
+		}
+		r := bufio.NewReader(bytes.NewReader(b))
+		return http.ReadResponse(r, req)
+	})
+}
+
 // ReplayFS returns an http.RoundTripper that reads its
 // responses from text files in the fs.FS.
 // Responses are looked up according to a hash of the request.