Go: implement ASR in ZhipuAI driver (#15134)

### What problem does this PR solve? This PR implements ASR and TTS support for the ZhipuAI Go driver. The ZhipuAI model config already advertises `glm-asr-2512` as an ASR model, but the Go driver returned `zhipu, no such method` from `TranscribeAudio`. This adds the documented audio transcription endpoint suffix and sends multipart transcription requests with `model`, `stream=false`, and `file` fields. Per maintainer review, this also adds the ZhipuAI TTS endpoint suffix and implements `AudioSpeech` / `AudioSpeechWithSender` for `glm-tts`. Closes #15133 ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) - [x] New Feature (non-breaking change which adds functionality)
2026-05-24 01:47:36 +08:00 · 2026-05-21 17:53:18 -10:00
parent b2053cc3c7
commit b2bf9155ed
3 changed files with 594 additions and 6 deletions
--- a/conf/models/zhipu-ai.json
+++ b/conf/models/zhipu-ai.json
@ -9,6 +9,8 @@
    "async_result": "async-result",
    "embedding": "embeddings",
    "rerank": "rerank",
+    "asr": "audio/transcriptions",
+    "tts": "audio/speech",
    "files": "files",
    "models": "models"
  },
@ -268,4 +270,4 @@
      ]
    }
  ]
-}
+}
--- a/internal/entity/models/zhipu-ai.go
+++ b/internal/entity/models/zhipu-ai.go
@ -22,7 +22,10 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"mime/multipart"
 	"net/http"
+	"os"
+	"path/filepath"
 	"ragflow/internal/common"
 	"strings"
 	"time"
@ -668,8 +671,129 @@ func (z *ZhipuAIModel) Rerank(modelName *string, query string, documents []strin
 }

 // TranscribeAudio transcribe audio
-func (o *ZhipuAIModel) TranscribeAudio(modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig) (*ASRResponse, error) {
-	return nil, fmt.Errorf("%s, no such method", o.Name())
+func (z *ZhipuAIModel) TranscribeAudio(modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig) (*ASRResponse, error) {
+	if apiConfig == nil || apiConfig.ApiKey == nil || *apiConfig.ApiKey == "" {
+		return nil, fmt.Errorf("api key is required")
+	}
+	if modelName == nil || *modelName == "" {
+		return nil, fmt.Errorf("model name is required")
+	}
+	if file == nil || *file == "" {
+		return nil, fmt.Errorf("file is required")
+	}
+	if z.URLSuffix.ASR == "" {
+		return nil, fmt.Errorf("zhipu-ai: ASR URL suffix is not configured")
+	}
+
+	region := "default"
+	if apiConfig.Region != nil && *apiConfig.Region != "" {
+		region = *apiConfig.Region
+	}
+	baseURL, ok := z.BaseURL[region]
+	if !ok || baseURL == "" {
+		return nil, fmt.Errorf("zhipu-ai: no base URL configured for region %q", region)
+	}
+	url := fmt.Sprintf("%s/%s", strings.TrimSuffix(baseURL, "/"), strings.TrimLeft(z.URLSuffix.ASR, "/"))
+
+	var body bytes.Buffer
+	writer := multipart.NewWriter(&body)
+	if err := writer.WriteField("model", *modelName); err != nil {
+		return nil, fmt.Errorf("failed to write model field: %w", err)
+	}
+	if err := writer.WriteField("stream", "false"); err != nil {
+		return nil, fmt.Errorf("failed to write stream field: %w", err)
+	}
+	if err := writeZhipuASRParams(writer, asrConfig); err != nil {
+		return nil, err
+	}
+
+	audioFile, err := os.Open(*file)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open audio file: %w", err)
+	}
+	defer audioFile.Close()
+
+	part, err := writer.CreateFormFile("file", filepath.Base(*file))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create multipart file: %w", err)
+	}
+	if _, err = io.Copy(part, audioFile); err != nil {
+		return nil, fmt.Errorf("failed to copy audio data: %w", err)
+	}
+	if err = writer.Close(); err != nil {
+		return nil, fmt.Errorf("failed to close multipart writer: %w", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, url, &body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+
+	resp, err := z.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("ZhipuAI ASR API error: %s, body: %s", resp.Status, string(respBody))
+	}
+
+	var result struct {
+		Text string `json:"text"`
+	}
+	if err = json.Unmarshal(respBody, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+	return &ASRResponse{Text: result.Text}, nil
+}
+
+func writeZhipuASRParams(writer *multipart.Writer, asrConfig *ASRConfig) error {
+	if asrConfig == nil || asrConfig.Params == nil {
+		return nil
+	}
+	for key, value := range asrConfig.Params {
+		switch key {
+		case "model", "stream", "file", "file_base64":
+			continue
+		}
+		if err := writeZhipuASRField(writer, key, value); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func writeZhipuASRField(writer *multipart.Writer, key string, value interface{}) error {
+	switch v := value.(type) {
+	case nil:
+		return nil
+	case []string:
+		for _, item := range v {
+			if err := writer.WriteField(key, item); err != nil {
+				return fmt.Errorf("failed to write field %s: %w", key, err)
+			}
+		}
+		return nil
+	case []interface{}:
+		for _, item := range v {
+			if err := writer.WriteField(key, fmt.Sprint(item)); err != nil {
+				return fmt.Errorf("failed to write field %s: %w", key, err)
+			}
+		}
+		return nil
+	default:
+		if err := writer.WriteField(key, fmt.Sprint(v)); err != nil {
+			return fmt.Errorf("failed to write field %s: %w", key, err)
+		}
+		return nil
+	}
 }

 func (z *ZhipuAIModel) TranscribeAudioWithSender(modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig, sender func(*string, *string) error) error {
@ -677,12 +801,135 @@ func (z *ZhipuAIModel) TranscribeAudioWithSender(modelName *string, file *string
 }

 // AudioSpeech convert text to audio
-func (o *ZhipuAIModel) AudioSpeech(modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig) (*TTSResponse, error) {
-	return nil, fmt.Errorf("%s, no such method", o.Name())
+func (z *ZhipuAIModel) AudioSpeech(modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig) (*TTSResponse, error) {
+	reqBody, url, err := z.buildTTSRequest(modelName, audioContent, apiConfig, ttsConfig, false)
+	if err != nil {
+		return nil, err
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+
+	resp, err := z.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("ZhipuAI TTS API error: %s, body: %s", resp.Status, string(body))
+	}
+
+	return &TTSResponse{Audio: body}, nil
 }

 func (z *ZhipuAIModel) AudioSpeechWithSender(modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig, sender func(*string, *string) error) error {
-	return fmt.Errorf("%s, no such method", z.Name())
+	if sender == nil {
+		return fmt.Errorf("sender is required")
+	}
+	reqBody, url, err := z.buildTTSRequest(modelName, audioContent, apiConfig, ttsConfig, true)
+	if err != nil {
+		return err
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+
+	resp, err := z.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("ZhipuAI stream TTS API error: %s, body: %s", resp.Status, string(body))
+	}
+
+	buf := make([]byte, 32*1024)
+	for {
+		n, err := resp.Body.Read(buf)
+		if n > 0 {
+			chunk := string(buf[:n])
+			if errSend := sender(&chunk, nil); errSend != nil {
+				return errSend
+			}
+		}
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return fmt.Errorf("error reading ZhipuAI binary audio stream: %w", err)
+		}
+	}
+	return nil
+}
+
+func (z *ZhipuAIModel) buildTTSRequest(modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig, stream bool) (map[string]interface{}, string, error) {
+	if apiConfig == nil || apiConfig.ApiKey == nil || *apiConfig.ApiKey == "" {
+		return nil, "", fmt.Errorf("api key is required")
+	}
+	if modelName == nil || *modelName == "" {
+		return nil, "", fmt.Errorf("model name is required")
+	}
+	if audioContent == nil || *audioContent == "" {
+		return nil, "", fmt.Errorf("audio content is empty")
+	}
+	if z.URLSuffix.TTS == "" {
+		return nil, "", fmt.Errorf("zhipu-ai: TTS URL suffix is not configured")
+	}
+
+	region := "default"
+	if apiConfig.Region != nil && *apiConfig.Region != "" {
+		region = *apiConfig.Region
+	}
+	baseURL, ok := z.BaseURL[region]
+	if !ok || baseURL == "" {
+		return nil, "", fmt.Errorf("zhipu-ai: no base URL configured for region %q", region)
+	}
+
+	reqBody := map[string]interface{}{
+		"model":  *modelName,
+		"input":  *audioContent,
+		"stream": stream,
+	}
+	if ttsConfig != nil {
+		for key, value := range ttsConfig.Params {
+			switch key {
+			case "model", "input", "stream", "response_format":
+				continue
+			}
+			reqBody[key] = value
+		}
+		if ttsConfig.Format != "" {
+			reqBody["response_format"] = ttsConfig.Format
+		}
+	}
+
+	url := fmt.Sprintf("%s/%s", strings.TrimSuffix(baseURL, "/"), strings.TrimLeft(z.URLSuffix.TTS, "/"))
+	return reqBody, url, nil
 }

 // OCRFile OCR file
--- a/internal/entity/models/zhipu_ai_test.go
+++ b/internal/entity/models/zhipu_ai_test.go
@ -0,0 +1,339 @@
+package models
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strings"
+	"testing"
+)
+
+func newZhipuAIForTest(baseURL string) *ZhipuAIModel {
+	return NewZhipuAIModel(
+		map[string]string{"default": baseURL},
+		URLSuffix{ASR: "audio/transcriptions", TTS: "audio/speech"},
+	)
+}
+
+func writeZhipuAITestAudio(t *testing.T) string {
+	t.Helper()
+
+	file, err := os.CreateTemp(t.TempDir(), "speech-*.mp3")
+	if err != nil {
+		t.Fatalf("create temp audio: %v", err)
+	}
+	defer file.Close()
+
+	if _, err = file.WriteString("fake audio"); err != nil {
+		t.Fatalf("write temp audio: %v", err)
+	}
+	return file.Name()
+}
+
+func TestZhipuAITranscribeAudio(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Errorf("method=%s", r.Method)
+			return
+		}
+		if r.URL.Path != "/audio/transcriptions" {
+			t.Errorf("path=%s", r.URL.Path)
+			return
+		}
+		if got := r.Header.Get("Authorization"); got != "Bearer test-key" {
+			t.Errorf("Authorization=%q", got)
+			return
+		}
+		if got := r.Header.Get("Content-Type"); !strings.HasPrefix(got, "multipart/form-data") {
+			t.Errorf("Content-Type=%q", got)
+			return
+		}
+
+		if err := r.ParseMultipartForm(1024 * 1024); err != nil {
+			t.Errorf("ParseMultipartForm: %v", err)
+			return
+		}
+		if got := r.FormValue("model"); got != "glm-asr-2512" {
+			t.Errorf("model=%q", got)
+		}
+		if got := r.MultipartForm.Value["model"]; len(got) != 1 {
+			t.Errorf("model values=%v", got)
+		}
+		if got := r.FormValue("stream"); got != "false" {
+			t.Errorf("stream=%q", got)
+		}
+		if got := r.MultipartForm.Value["stream"]; len(got) != 1 {
+			t.Errorf("stream values=%v", got)
+		}
+		if got := r.FormValue("prompt"); got != "previous transcript" {
+			t.Errorf("prompt=%q", got)
+		}
+		if got := r.FormValue("user_id"); got != "12345" {
+			t.Errorf("user_id=%q", got)
+		}
+		if got := r.MultipartForm.Value["hotwords"]; len(got) != 2 || got[0] != "RAGFlow" || got[1] != "ZhipuAI" {
+			t.Errorf("hotwords=%v", got)
+		}
+		if got := r.MultipartForm.Value["file"]; len(got) != 0 {
+			t.Errorf("file values=%v", got)
+		}
+		if _, _, err := r.FormFile("file"); err != nil {
+			t.Errorf("file field: %v", err)
+			return
+		}
+
+		_ = json.NewEncoder(w).Encode(map[string]string{"text": "hello world"})
+	}))
+	defer srv.Close()
+
+	apiKey := "test-key"
+	modelName := "glm-asr-2512"
+	file := writeZhipuAITestAudio(t)
+	resp, err := newZhipuAIForTest(srv.URL).TranscribeAudio(
+		&modelName,
+		&file,
+		&APIConfig{ApiKey: &apiKey},
+		&ASRConfig{Params: map[string]interface{}{
+			"prompt":    "previous transcript",
+			"hotwords":  []string{"RAGFlow", "ZhipuAI"},
+			"model":     "ignored-model",
+			"stream":    true,
+			"file":      "ignored-file",
+			"user_id":   12345,
+			"nil_value": nil,
+		}},
+	)
+	if err != nil {
+		t.Fatalf("TranscribeAudio: %v", err)
+	}
+	if resp.Text != "hello world" {
+		t.Errorf("Text=%q", resp.Text)
+	}
+}
+
+func TestZhipuAITranscribeAudioValidation(t *testing.T) {
+	apiKey := "test-key"
+	modelName := "glm-asr-2512"
+	file := "speech.mp3"
+
+	tests := []struct {
+		name      string
+		modelName *string
+		file      *string
+		apiConfig *APIConfig
+		want      string
+	}{
+		{name: "missing api key", modelName: &modelName, file: &file, apiConfig: &APIConfig{}, want: "api key is required"},
+		{name: "missing model", modelName: nil, file: &file, apiConfig: &APIConfig{ApiKey: &apiKey}, want: "model name is required"},
+		{name: "missing file", modelName: &modelName, file: nil, apiConfig: &APIConfig{ApiKey: &apiKey}, want: "file is required"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := newZhipuAIForTest("http://unused").TranscribeAudio(tt.modelName, tt.file, tt.apiConfig, nil)
+			if err == nil || !strings.Contains(err.Error(), tt.want) {
+				t.Fatalf("error=%v, want %q", err, tt.want)
+			}
+		})
+	}
+}
+
+func TestZhipuAITranscribeAudioRequiresASRSuffix(t *testing.T) {
+	apiKey := "test-key"
+	modelName := "glm-asr-2512"
+	file := writeZhipuAITestAudio(t)
+	_, err := NewZhipuAIModel(map[string]string{"default": "http://unused"}, URLSuffix{}).TranscribeAudio(
+		&modelName,
+		&file,
+		&APIConfig{ApiKey: &apiKey},
+		nil,
+	)
+	if err == nil || !strings.Contains(err.Error(), "ASR URL suffix is not configured") {
+		t.Fatalf("error=%v", err)
+	}
+}
+
+func TestZhipuAITranscribeAudioHTTPError(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusBadRequest)
+		_, _ = io.WriteString(w, `{"error":"bad request"}`)
+	}))
+	defer srv.Close()
+
+	apiKey := "test-key"
+	modelName := "glm-asr-2512"
+	file := writeZhipuAITestAudio(t)
+	_, err := newZhipuAIForTest(srv.URL).TranscribeAudio(&modelName, &file, &APIConfig{ApiKey: &apiKey}, nil)
+	if err == nil || !strings.Contains(err.Error(), "ZhipuAI ASR API error: 400 Bad Request") {
+		t.Fatalf("error=%v", err)
+	}
+}
+
+func TestZhipuAIAudioSpeech(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Errorf("method=%s", r.Method)
+			return
+		}
+		if r.URL.Path != "/audio/speech" {
+			t.Errorf("path=%s", r.URL.Path)
+			return
+		}
+		if got := r.Header.Get("Authorization"); got != "Bearer test-key" {
+			t.Errorf("Authorization=%q", got)
+			return
+		}
+		if got := r.Header.Get("Content-Type"); !strings.HasPrefix(got, "application/json") {
+			t.Errorf("Content-Type=%q", got)
+			return
+		}
+
+		var body map[string]interface{}
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			t.Errorf("Decode: %v", err)
+			return
+		}
+		if body["model"] != "glm-tts" {
+			t.Errorf("model=%v", body["model"])
+		}
+		if body["input"] != "hello" {
+			t.Errorf("input=%v", body["input"])
+		}
+		if body["stream"] != false {
+			t.Errorf("stream=%v", body["stream"])
+		}
+		if body["voice"] != "zhipu" {
+			t.Errorf("voice=%v", body["voice"])
+		}
+		if body["response_format"] != "mp3" {
+			t.Errorf("response_format=%v", body["response_format"])
+		}
+
+		_, _ = w.Write([]byte("audio-bytes"))
+	}))
+	defer srv.Close()
+
+	apiKey := "test-key"
+	modelName := "glm-tts"
+	content := "hello"
+	resp, err := newZhipuAIForTest(srv.URL).AudioSpeech(
+		&modelName,
+		&content,
+		&APIConfig{ApiKey: &apiKey},
+		&TTSConfig{Format: "mp3", Params: map[string]interface{}{
+			"voice":           "zhipu",
+			"model":           "ignored-model",
+			"input":           "ignored-input",
+			"stream":          true,
+			"response_format": "wav",
+		}},
+	)
+	if err != nil {
+		t.Fatalf("AudioSpeech: %v", err)
+	}
+	if string(resp.Audio) != "audio-bytes" {
+		t.Errorf("Audio=%q", string(resp.Audio))
+	}
+}
+
+func TestZhipuAIAudioSpeechWithSender(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var body map[string]interface{}
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			t.Errorf("Decode: %v", err)
+			return
+		}
+		if body["stream"] != true {
+			t.Errorf("stream=%v", body["stream"])
+		}
+		_, _ = w.Write([]byte("chunk-one"))
+		_, _ = w.Write([]byte("chunk-two"))
+	}))
+	defer srv.Close()
+
+	apiKey := "test-key"
+	modelName := "glm-tts"
+	content := "hello"
+	var chunks []string
+	err := newZhipuAIForTest(srv.URL).AudioSpeechWithSender(
+		&modelName,
+		&content,
+		&APIConfig{ApiKey: &apiKey},
+		nil,
+		func(content *string, reasoning *string) error {
+			if content != nil {
+				chunks = append(chunks, *content)
+			}
+			if reasoning != nil {
+				t.Errorf("reasoning=%q", *reasoning)
+			}
+			return nil
+		},
+	)
+	if err != nil {
+		t.Fatalf("AudioSpeechWithSender: %v", err)
+	}
+	if strings.Join(chunks, "") != "chunk-onechunk-two" {
+		t.Errorf("chunks=%q", strings.Join(chunks, ""))
+	}
+}
+
+func TestZhipuAIAudioSpeechValidation(t *testing.T) {
+	apiKey := "test-key"
+	modelName := "glm-tts"
+	content := "hello"
+
+	tests := []struct {
+		name         string
+		modelName    *string
+		audioContent *string
+		apiConfig    *APIConfig
+		want         string
+	}{
+		{name: "missing api key", modelName: &modelName, audioContent: &content, apiConfig: &APIConfig{}, want: "api key is required"},
+		{name: "missing model", modelName: nil, audioContent: &content, apiConfig: &APIConfig{ApiKey: &apiKey}, want: "model name is required"},
+		{name: "missing content", modelName: &modelName, audioContent: nil, apiConfig: &APIConfig{ApiKey: &apiKey}, want: "audio content is empty"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := newZhipuAIForTest("http://unused").AudioSpeech(tt.modelName, tt.audioContent, tt.apiConfig, nil)
+			if err == nil || !strings.Contains(err.Error(), tt.want) {
+				t.Fatalf("error=%v, want %q", err, tt.want)
+			}
+		})
+	}
+}
+
+func TestZhipuAIAudioSpeechRequiresTTSSuffix(t *testing.T) {
+	apiKey := "test-key"
+	modelName := "glm-tts"
+	content := "hello"
+	_, err := NewZhipuAIModel(map[string]string{"default": "http://unused"}, URLSuffix{}).AudioSpeech(
+		&modelName,
+		&content,
+		&APIConfig{ApiKey: &apiKey},
+		nil,
+	)
+	if err == nil || !strings.Contains(err.Error(), "TTS URL suffix is not configured") {
+		t.Fatalf("error=%v", err)
+	}
+}
+
+func TestZhipuAIAudioSpeechHTTPError(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusBadRequest)
+		_, _ = io.WriteString(w, `{"error":"bad request"}`)
+	}))
+	defer srv.Close()
+
+	apiKey := "test-key"
+	modelName := "glm-tts"
+	content := "hello"
+	_, err := newZhipuAIForTest(srv.URL).AudioSpeech(&modelName, &content, &APIConfig{ApiKey: &apiKey}, nil)
+	if err == nil || !strings.Contains(err.Error(), "ZhipuAI TTS API error: 400 Bad Request") {
+		t.Fatalf("error=%v", err)
+	}
+}