Enforce continuous validation

internal/adapters/whisperx/http.go

@@ -99,7 +99,9 @@ func NewHTTPClient(cfg HTTPClientConfig) (*HTTPClient, error) {
 
 	client := cfg.HTTPClient
 	if client == nil {
-		client = &http.Client{}
+		transport := http.DefaultTransport.(*http.Transport).Clone()
+		transport.ExpectContinueTimeout = 100 * time.Millisecond
+		client = &http.Client{Transport: transport}
 	}
 
 	maxBytes := cfg.MaxResponseBytes
@@ -198,6 +200,7 @@ func (c *HTTPClient) doTranscribeAttempt(ctx context.Context, audioPath string)
 		return 0, nil, fmt.Errorf("build whisperx request: %w", err)
 	}
 	req.Header.Set("Content-Type", upload.contentType)
+	req.Header.Set("Expect", "100-continue")
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -211,6 +214,9 @@ func (c *HTTPClient) doTranscribeAttempt(ctx context.Context, audioPath string)
 
 	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
 		_ = upload.Close()
+		if producerErr := upload.Wait(); producerErr != nil {
+			return resp.StatusCode, nil, fmt.Errorf("stream whisperx request body: %w", producerErr)
+		}
 		if _, err := readWhisperXResponse(resp.Body, c.maxResponseBytes); err != nil {
 			return resp.StatusCode, nil, fmt.Errorf("read whisperx response body: %w", err)
 		}
@@ -333,7 +339,6 @@ func (u *multipartUpload) Read(p []byte) (int, error) {
 
 func (u *multipartUpload) Close() error {
 	u.abort()
-	<-u.done
 	return nil
 }