1 files changed, 28 insertions, 9 deletions
diff --git a/response.go b/response.go
index bf23f20..3ecb961 100644
--- a/response.go
+++ b/response.go
@@ -76,7 +76,7 @@ func (r *Response) Name() string {
 
 // SetName sets the name response parameter.
 //
-// An error is raised if the name includes characters not valid in a filename
+// Returns an error if the name includes characters not valid in a filename
 // (slash, null byte).
 func (r *Response) SetName(name string) error {
 	return setFilename(&r.Message, "name", name)
@@ -93,7 +93,7 @@ func (r *Response) Type() string {
 
 // SetType sets the type response parameter.
 //
-// An error is raised if typ is not a valid format for a MIME type.
+// Returns an error if typ is not a valid format for a MIME type.
 func (r *Response) SetType(typ string) error {
 	return setType(&r.Message, "type", typ)
 }
@@ -131,11 +131,11 @@ func (r *Response) Modified() time.Time {
 
 // SetModified sets the modified response parameter.
 //
-// If the time response parameter is empty, it's set to the current time.
-// If t is the zero time value, the modified parameter is unset.
+// If t is the zero time value, the modified parameter is unset. Otherwise, if
+// the time response parameter is empty, it's set to the current time.
 func (r *Response) SetModified(t time.Time) {
 	setTime(&r.Message, "modified", t)
-	if r.Time().IsZero() {
+	if !t.IsZero() && r.Time().IsZero() {
 		r.SetTime(time.Now())
 	}
 }
@@ -159,14 +159,15 @@ func (r *Response) Location() (host, path string, err error) {
 
 // SetLocation sets the location response parameter to host and path.
 //
-// If the host or path are invalid
+// Returns an error if the host or path are invalid.
 func (r *Response) SetLocation(host, path string) error {
+	err := ErrorInvalid{"invalid response: invalid location parameter"}
 	if strings.ContainsRune(host, '/') {
-		return ErrorInvalid{"invalid response: invalid location parameter"}
+		return err
 	}
 	l := host + path
 	if err := validateRequestIntent(l); err != nil {
-		return ErrorInvalid{"invalid response: invalid location parameter"}
+		return err
 	}
 	r.SetParam("location", l)
 	return nil
@@ -208,8 +209,23 @@ func (r *Response) SetReason(reason string) error {
 	return nil
 }
 
+// Select retrieves the select response parameter.
+//
+// If the parameter isn't a valid selector, empty strings are returned.
+func (r *Response) Select() (selector, query string) {
+	selector, query, _ = getSelect(&r.Message, "select")
+	return
+}
+
+// SetSelect sets the select response parameter.
+//
+// If the selector name is empty, the select parameter is unset.
+func (r *Response) SetSelect(selector, query string) error {
+	return setSelect(&r.Message, "select", selector, query)
+}
+
 // Validate validates the response intent and header parameter value format
-// (length, name, type, time, modified, location, reason)
+// (length, name, type, time, modified, location, reason, select)
 func (r *Response) Validate() error {
 	if !responseIntents[r.Intent()] {
 		return ErrorInvalid{"invalid response: unknown response intent"}
@@ -237,6 +253,9 @@ func (r *Response) Validate() error {
 	if !responseErrorReasons[r.Param("reason")] {
 		return ErrorInvalid{"invalid response: unknown error reason"}
 	}
+	if _, _, err := getSelect(&r.Message, "select"); err != nil {
+		return err
+	}
 	return nil
 }