Drop usage of deprecated ioutil pkg

Author: mccutchen

httpbin/handlers_test.go

@@ -9,7 +9,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"math/rand"
 	"mime/multipart"
@@ -40,7 +40,7 @@ var app = New(
 	WithDefaultParams(testDefaultParams),
 	WithMaxBodySize(maxBodySize),
 	WithMaxDuration(maxDuration),
-	WithObserver(StdLogObserver(log.New(ioutil.Discard, "", 0))),
+	WithObserver(StdLogObserver(log.New(io.Discard, "", 0))),
 )
 
 var handler = app.Handler()
@@ -1489,7 +1489,7 @@ func TestGzip(t *testing.T) {
 		t.Fatalf("error creating gzip reader: %s", err)
 	}
 
-	unzippedBody, err := ioutil.ReadAll(gzipReader)
+	unzippedBody, err := io.ReadAll(gzipReader)
 	if err != nil {
 		t.Fatalf("error reading gzipped body: %s", err)
 	}
@@ -1533,7 +1533,7 @@ func TestDeflate(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	body, err := ioutil.ReadAll(reader)
+	body, err := io.ReadAll(reader)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1805,7 +1805,7 @@ func TestDrip(t *testing.T) {
 		}
 		defer resp.Body.Close()
 
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		if err != nil {
 			t.Fatalf("error reading response body: %s", err)
 		}
@@ -1829,7 +1829,7 @@ func TestDrip(t *testing.T) {
 		}
 
 		// in this case, the timeout happens while trying to read the body
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err == nil {
 			t.Fatal("expected timeout reading body")
 		}
@@ -1892,7 +1892,7 @@ func TestDrip(t *testing.T) {
 		}
 		defer resp.Body.Close()
 
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			t.Fatalf("error reading response body: %s", err)
 		}

httpbin/helpers.go

@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"net/http"
 	"net/url"
@@ -109,7 +108,7 @@ func parseBody(w http.ResponseWriter, r *http.Request, resp *bodyResponse) error
 
 	// Always set resp.Data to the incoming request body, in case we don't know
 	// how to handle the content type
-	body, err := ioutil.ReadAll(r.Body)
+	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		r.Body.Close()
 		return err
@@ -119,7 +118,7 @@ func parseBody(w http.ResponseWriter, r *http.Request, resp *bodyResponse) error
 	// After reading the body to populate resp.Data, we need to re-wrap it in
 	// an io.Reader for further processing below
 	r.Body.Close()
-	r.Body = ioutil.NopCloser(bytes.NewBuffer(body))
+	r.Body = io.NopCloser(bytes.NewBuffer(body))
 
 	ct := r.Header.Get("Content-Type")
 	switch {