diff --git a/vendor/go.uber.org/zap/http_handler.go b/vendor/go.uber.org/zap/http_handler.go
index 1b0ecac..1297c33 100644
--- a/vendor/go.uber.org/zap/http_handler.go
+++ b/vendor/go.uber.org/zap/http_handler.go
@@ -23,6 +23,7 @@
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 
 	"go.uber.org/zap/zapcore"
@@ -31,47 +32,63 @@
 // ServeHTTP is a simple JSON endpoint that can report on or change the current
 // logging level.
 //
-// GET requests return a JSON description of the current logging level. PUT
-// requests change the logging level and expect a payload like:
+// GET
+//
+// The GET request returns a JSON description of the current logging level like:
 //   {"level":"info"}
 //
-// It's perfectly safe to change the logging level while a program is running.
+// PUT
+//
+// The PUT request changes the logging level. It is perfectly safe to change the
+// logging level while a program is running. Two content types are supported:
+//
+//    Content-Type: application/x-www-form-urlencoded
+//
+// With this content type, the level can be provided through the request body or
+// a query parameter. The log level is URL encoded like:
+//
+//    level=debug
+//
+// The request body takes precedence over the query parameter, if both are
+// specified.
+//
+// This content type is the default for a curl PUT request. Following are two
+// example curl requests that both set the logging level to debug.
+//
+//    curl -X PUT localhost:8080/log/level?level=debug
+//    curl -X PUT localhost:8080/log/level -d level=debug
+//
+// For any other content type, the payload is expected to be JSON encoded and
+// look like:
+//
+//   {"level":"info"}
+//
+// An example curl request could look like this:
+//
+//    curl -X PUT localhost:8080/log/level -H "Content-Type: application/json" -d '{"level":"debug"}'
+//
 func (lvl AtomicLevel) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	type errorResponse struct {
 		Error string `json:"error"`
 	}
 	type payload struct {
-		Level *zapcore.Level `json:"level"`
+		Level zapcore.Level `json:"level"`
 	}
 
 	enc := json.NewEncoder(w)
 
 	switch r.Method {
-
 	case http.MethodGet:
-		current := lvl.Level()
-		enc.Encode(payload{Level: &current})
-
+		enc.Encode(payload{Level: lvl.Level()})
 	case http.MethodPut:
-		var req payload
-
-		if errmess := func() string {
-			if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-				return fmt.Sprintf("Request body must be well-formed JSON: %v", err)
-			}
-			if req.Level == nil {
-				return "Must specify a logging level."
-			}
-			return ""
-		}(); errmess != "" {
+		requestedLvl, err := decodePutRequest(r.Header.Get("Content-Type"), r)
+		if err != nil {
 			w.WriteHeader(http.StatusBadRequest)
-			enc.Encode(errorResponse{Error: errmess})
+			enc.Encode(errorResponse{Error: err.Error()})
 			return
 		}
-
-		lvl.SetLevel(*req.Level)
-		enc.Encode(req)
-
+		lvl.SetLevel(requestedLvl)
+		enc.Encode(payload{Level: lvl.Level()})
 	default:
 		w.WriteHeader(http.StatusMethodNotAllowed)
 		enc.Encode(errorResponse{
@@ -79,3 +96,37 @@
 		})
 	}
 }
+
+// Decodes incoming PUT requests and returns the requested logging level.
+func decodePutRequest(contentType string, r *http.Request) (zapcore.Level, error) {
+	if contentType == "application/x-www-form-urlencoded" {
+		return decodePutURL(r)
+	}
+	return decodePutJSON(r.Body)
+}
+
+func decodePutURL(r *http.Request) (zapcore.Level, error) {
+	lvl := r.FormValue("level")
+	if lvl == "" {
+		return 0, fmt.Errorf("must specify logging level")
+	}
+	var l zapcore.Level
+	if err := l.UnmarshalText([]byte(lvl)); err != nil {
+		return 0, err
+	}
+	return l, nil
+}
+
+func decodePutJSON(body io.Reader) (zapcore.Level, error) {
+	var pld struct {
+		Level *zapcore.Level `json:"level"`
+	}
+	if err := json.NewDecoder(body).Decode(&pld); err != nil {
+		return 0, fmt.Errorf("malformed request body: %v", err)
+	}
+	if pld.Level == nil {
+		return 0, fmt.Errorf("must specify logging level")
+	}
+	return *pld.Level, nil
+
+}