diff --git a/src/net/http/transport.go b/src/net/http/transport.go
index 2a508ec41b..184cf27518 100644
--- a/src/net/http/transport.go
+++ b/src/net/http/transport.go
@@ -2057,7 +2057,7 @@ func (pc *persistConn) mapRoundTripError(req *transportRequest, startBytesWritte
 		if pc.nwrite == startBytesWritten {
 			return nothingWrittenError{err}
 		}
-		return fmt.Errorf("net/http: HTTP/1.x transport connection broken: %v", err)
+		return fmt.Errorf("net/http: HTTP/1.x transport connection broken: %w", err)
 	}
 	return err
 }
@@ -2264,7 +2264,7 @@ func (pc *persistConn) readLoopPeekFailLocked(peekErr error) {
 		// common case.
 		pc.closeLocked(errServerClosedIdle)
 	} else {
-		pc.closeLocked(fmt.Errorf("readLoopPeekFailLocked: %v", peekErr))
+		pc.closeLocked(fmt.Errorf("readLoopPeekFailLocked: %w", peekErr))
 	}
 }
 
@@ -2398,6 +2398,10 @@ type nothingWrittenError struct {
 	error
 }
 
+func (nwe nothingWrittenError) Unwrap() error {
+	return nwe.error
+}
+
 func (pc *persistConn) writeLoop() {
 	defer close(pc.writeLoopDone)
 	for {
@@ -2635,7 +2639,7 @@ func (pc *persistConn) roundTrip(req *transportRequest) (resp *Response, err err
 				req.logf("writeErrCh resv: %T/%#v", err, err)
 			}
 			if err != nil {
-				pc.close(fmt.Errorf("write error: %v", err))
+				pc.close(fmt.Errorf("write error: %w", err))
 				return nil, pc.mapRoundTripError(req, startBytesWritten, err)
 			}
 			if d := pc.t.ResponseHeaderTimeout; d > 0 {