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Flutter: text-to-audio api is not working: Error: The status code of 500 has the following meaning: "Server error - the server failed to fulfil an apparently valid request" #4632

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opened 2026-02-21 18:07:19 -05:00 by yindo · 5 comments
yindo commented 2026-02-21 18:07:19 -05:00
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Originally created by @abdullah432 on GitHub (Jul 16, 2024).

Self Checks

  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
  • 请务必使用英文提交 Issue，否则会被关闭。谢谢！:）
  • Please do not modify this template :) and fill in all the required fields.

Dify version

0.6.14

Cloud or Self Hosted

Cloud

Steps to reproduce

I implemented dify API for chat, vision, audio-to-text. It's all work good.

When I try to do text-to-audio then it's throwing following Exception.

This exception was thrown because the response has a status code of 500 and RequestOptions.validateStatus was configured to throw for this status code.
The status code of 500 has the following meaning: "Server error - the server failed to fulfil an apparently valid request"
Read more about status codes at https://developer.mozilla.org/en-US/docs/Web/HTTP/Status
In order to resolve this exception you typically have either to verify and fix your request code or you have to fix the server code.
[ERROR:flutter/shell/platform/darwin/ios/framework/Source/profiler_metrics_ios.mm(203)] Error retrieving thread information: (os/kern) invalid argument

I'm working on this from second day, so tried 100's of different ways, will share two below, which I think should work good.

First: Pass data with FormData as documentation mentioned it.

  Future<void> textToAudio({
    required String text,
    required String user,
    required bool streaming,
  }) async {
    const String url = 'https://api.dify.ai/v1/text-to-audio';
    var secretKey = "app-RaxAShID6WHEcy8PUo9PRuKY";

    try {
      var _dio = Dio();
      final response = await _dio.post(
        url,
        options: Options(
          headers: {
            'Authorization': 'Bearer $secretKey',
            'Content-Type': 'multipart/form-data',
          },
        ),
        data: FormData.fromMap({
          'text': text,
          'user': user,
          'streaming': streaming,
        }),
      );
      print(response.data);
    } on DioException catch (e) {
      print('Request failed with status: ${e.response?.statusCode}');
      print('Error: ${e.message}');
    }
  }

Second: with simple map form, in case server expect it that way. Also test with "Content-Type": "audio/wav" but it didn't help.

  Future<void> textToAudio({
    required String text,
    required String user,
    required bool streaming,
    required String secretKey,
  }) async {
    const String url = 'https://api.dify.ai/v1/text-to-audio';
    
    try {
      final response = await _dio.post(
        url,
        options: Options(
          headers: {
            'Authorization': 'Bearer $secretKey',
            'Content-Type': 'application/json',
          },
        ),
        data: {
          'text': text,
          'user': user,
          'streaming': streaming,
        },
      );
      print(response.data);
    } on DioException catch (e) {
      print('Request failed with status: ${e.response?.statusCode}');
      print('Error: ${e.message}');
      if (e.response != null) {
        print('Response data: ${e.response?.data}');
      }
    }
  }

A look into my dify console.

Screenshot 2024-07-16 at 3 08 09 PM

Can you help me what could be the problem. At dify console text to voice is working good.

✔️ Expected Behavior

Text should get converted to audio.

❌ Actual Behavior

I'm getting Exception while calling the API.

Originally created by @abdullah432 on GitHub (Jul 16, 2024). ### Self Checks - [X] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [X] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [X] I confirm that I am using English to submit this report (我已阅读并同意 [Language Policy](https://github.com/langgenius/dify/issues/1542)). - [X] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:） - [X] Please do not modify this template :) and fill in all the required fields. ### Dify version 0.6.14 ### Cloud or Self Hosted Cloud ### Steps to reproduce I implemented dify API for chat, vision, audio-to-text. It's all work good. When I try to do text-to-audio then it's throwing following Exception. ``` This exception was thrown because the response has a status code of 500 and RequestOptions.validateStatus was configured to throw for this status code. The status code of 500 has the following meaning: "Server error - the server failed to fulfil an apparently valid request" Read more about status codes at https://developer.mozilla.org/en-US/docs/Web/HTTP/Status In order to resolve this exception you typically have either to verify and fix your request code or you have to fix the server code. [ERROR:flutter/shell/platform/darwin/ios/framework/Source/profiler_metrics_ios.mm(203)] Error retrieving thread information: (os/kern) invalid argument ``` I'm working on this from second day, so tried 100's of different ways, will share two below, which I think should work good. First: Pass data with FormData as documentation mentioned it. ``` Future<void> textToAudio({ required String text, required String user, required bool streaming, }) async { const String url = 'https://api.dify.ai/v1/text-to-audio'; var secretKey = "app-RaxAShID6WHEcy8PUo9PRuKY"; try { var _dio = Dio(); final response = await _dio.post( url, options: Options( headers: { 'Authorization': 'Bearer $secretKey', 'Content-Type': 'multipart/form-data', }, ), data: FormData.fromMap({ 'text': text, 'user': user, 'streaming': streaming, }), ); print(response.data); } on DioException catch (e) { print('Request failed with status: ${e.response?.statusCode}'); print('Error: ${e.message}'); } } ``` Second: with simple map form, in case server expect it that way. Also test with ` "Content-Type": "audio/wav" ` but it didn't help. ``` Future<void> textToAudio({ required String text, required String user, required bool streaming, required String secretKey, }) async { const String url = 'https://api.dify.ai/v1/text-to-audio'; try { final response = await _dio.post( url, options: Options( headers: { 'Authorization': 'Bearer $secretKey', 'Content-Type': 'application/json', }, ), data: { 'text': text, 'user': user, 'streaming': streaming, }, ); print(response.data); } on DioException catch (e) { print('Request failed with status: ${e.response?.statusCode}'); print('Error: ${e.message}'); if (e.response != null) { print('Response data: ${e.response?.data}'); } } } ``` ### A look into my dify console. <img width="1512" alt="Screenshot 2024-07-16 at 3 08 09 PM" src="https://github.com/user-attachments/assets/8a696dc2-b492-44f0-b459-2b96ecfb05b4"> Can you help me what could be the problem. At dify console text to voice is working good. ### ✔️ Expected Behavior Text should get converted to audio. ### ❌ Actual Behavior I'm getting Exception while calling the API.
yindo added the 🐞 bug label 2026-02-21 18:07:19 -05:00
yindo closed this issue 2026-02-21 18:07:19 -05:00
yindo commented 2026-02-21 18:07:19 -05:00
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@dosubot[bot] commented on GitHub (Jul 16, 2024):

Hi @abdullah432! I'm here to help you with any bugs, questions, or contributions you have. Let's work together to resolve the issue you're facing.

The issue with the text-to-audio API in Flutter returning a status code of 500 could be caused by several exceptions that are being caught and logged as internal server errors. Here are some potential causes based on the provided code:

  1. AppModelConfigBrokenError: This indicates that the app model configuration is broken.
  2. NoAudioUploadedServiceError: This error occurs if no audio is uploaded.
  3. AudioTooLargeServiceError: This error is raised if the audio file is too large.
  4. UnsupportedAudioTypeServiceError: This error occurs if the audio type is unsupported.
  5. ProviderNotSupportSpeechToTextServiceError: This error indicates that the provider does not support speech-to-text.
  6. ProviderTokenNotInitError: This error occurs if the provider token is not initialized.
  7. QuotaExceededError: This error is raised if the provider quota is exceeded.
  8. ModelCurrentlyNotSupportError: This error indicates that the model currently does not support the requested operation.
  9. InvokeError: This error occurs during the invocation of the service.
  10. ValueError: This is a generic error for invalid values.
  11. Generic Exception: Any other unhandled exceptions.

The relevant part of the code is:

except services.errors.app_model_config.AppModelConfigBrokenError:
    logging.exception("App model config broken.")
    raise AppUnavailableError()
except NoAudioUploadedServiceError:
    raise NoAudioUploadedError()
except AudioTooLargeServiceError as e:
    raise AudioTooLargeError(str(e))
except UnsupportedAudioTypeServiceError:
    raise UnsupportedAudioTypeError()
except ProviderNotSupportSpeechToTextServiceError:
    raise ProviderNotSupportSpeechToTextError()
except ProviderTokenNotInitError as ex:
    raise ProviderNotInitializeError(ex.description)
except QuotaExceededError:
    raise ProviderQuotaExceededError()
except ModelCurrentlyNotSupportError:
    raise ProviderModelCurrentlyNotSupportError()
except InvokeError as e:
    raise CompletionRequestError(e.description)
except ValueError as e:
    raise e
except Exception as e:
    logging.exception(f"internal server error, {str(e)}.")
    raise InternalServerError()

To identify the exact cause, you would need to check the logs for the specific exception message that is being logged before the InternalServerError is raised. Additionally, ensure that the request payload is correctly formatted and all required fields are provided, as missing or incorrect data can also lead to these errors.

Based on the new context from Dify's api/controllers/console/explore/audio.py, additional specific errors related to text-to-speech services could also be causing the issue:

  1. ProviderNotSupportTextToSpeechServiceError: This error occurs if the provider does not support text-to-speech.
  2. ProviderNotSupportTextToSpeechLanageServiceError: This error occurs if the provider does not support the requested text-to-speech language.

Make sure to handle these specific exceptions as well:

except ProviderNotSupportTextToSpeechServiceError:
    raise ProviderNotSupportTextToSpeechError()
except ProviderNotSupportTextToSpeechLanageServiceError:
    raise ProviderNotSupportTextToSpeechLanguageError()

By including these additional checks, you can better diagnose and handle the specific issues causing the 500 status code [1][2][3][4][5].

To continue talking to Dosu, mention @dosu.

@dosubot[bot] commented on GitHub (Jul 16, 2024): <!-- Greeting --> Hi @abdullah432! I'm here to help you with any bugs, questions, or contributions you have. Let's work together to resolve the issue you're facing. <!-- Answer --> The issue with the text-to-audio API in Flutter returning a status code of 500 could be caused by several exceptions that are being caught and logged as internal server errors. Here are some potential causes based on the provided code: 1. **AppModelConfigBrokenError**: This indicates that the app model configuration is broken. 2. **NoAudioUploadedServiceError**: This error occurs if no audio is uploaded. 3. **AudioTooLargeServiceError**: This error is raised if the audio file is too large. 4. **UnsupportedAudioTypeServiceError**: This error occurs if the audio type is unsupported. 5. **ProviderNotSupportSpeechToTextServiceError**: This error indicates that the provider does not support speech-to-text. 6. **ProviderTokenNotInitError**: This error occurs if the provider token is not initialized. 7. **QuotaExceededError**: This error is raised if the provider quota is exceeded. 8. **ModelCurrentlyNotSupportError**: This error indicates that the model currently does not support the requested operation. 9. **InvokeError**: This error occurs during the invocation of the service. 10. **ValueError**: This is a generic error for invalid values. 11. **Generic Exception**: Any other unhandled exceptions. The relevant part of the code is: ```py except services.errors.app_model_config.AppModelConfigBrokenError: logging.exception("App model config broken.") raise AppUnavailableError() except NoAudioUploadedServiceError: raise NoAudioUploadedError() except AudioTooLargeServiceError as e: raise AudioTooLargeError(str(e)) except UnsupportedAudioTypeServiceError: raise UnsupportedAudioTypeError() except ProviderNotSupportSpeechToTextServiceError: raise ProviderNotSupportSpeechToTextError() except ProviderTokenNotInitError as ex: raise ProviderNotInitializeError(ex.description) except QuotaExceededError: raise ProviderQuotaExceededError() except ModelCurrentlyNotSupportError: raise ProviderModelCurrentlyNotSupportError() except InvokeError as e: raise CompletionRequestError(e.description) except ValueError as e: raise e except Exception as e: logging.exception(f"internal server error, {str(e)}.") raise InternalServerError() ``` To identify the exact cause, you would need to check the logs for the specific exception message that is being logged before the `InternalServerError` is raised. Additionally, ensure that the request payload is correctly formatted and all required fields are provided, as missing or incorrect data can also lead to these errors. Based on the new context from Dify's `api/controllers/console/explore/audio.py`, additional specific errors related to text-to-speech services could also be causing the issue: 1. **ProviderNotSupportTextToSpeechServiceError**: This error occurs if the provider does not support text-to-speech. 2. **ProviderNotSupportTextToSpeechLanageServiceError**: This error occurs if the provider does not support the requested text-to-speech language. Make sure to handle these specific exceptions as well: ```py except ProviderNotSupportTextToSpeechServiceError: raise ProviderNotSupportTextToSpeechError() except ProviderNotSupportTextToSpeechLanageServiceError: raise ProviderNotSupportTextToSpeechLanguageError() ``` By including these additional checks, you can better diagnose and handle the specific issues causing the 500 status code <sup>[[1]](https://github.com/langgenius/dify/blob/main/api/controllers/web/audio.py)</sup><sup>[[2]](https://github.com/langgenius/dify/blob/main/api/controllers/service_api/app/audio.py)</sup><sup>[[3]](https://github.com/langgenius/dify/blob/main/api/controllers/console/app/audio.py)</sup><sup>[[4]](https://github.com/langgenius/dify/blob/main/api/services/errors/audio.py)</sup><sup>[[5]](https://github.com/langgenius/dify/blob/main/api/controllers/console/explore/audio.py)</sup>. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.*
yindo commented 2026-02-21 18:07:19 -05:00
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@crazywoola commented on GitHub (Jul 16, 2024):

@charli117 Could you take a look at this one?

@crazywoola commented on GitHub (Jul 16, 2024): @charli117 Could you take a look at this one?
yindo commented 2026-02-21 18:07:19 -05:00
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@charli117 commented on GitHub (Jul 16, 2024):

@crazywoola This bug has been fixed 6349

@charli117 commented on GitHub (Jul 16, 2024): @crazywoola This bug has been fixed [6349](https://github.com/langgenius/dify/pull/6349)
yindo commented 2026-02-21 18:07:19 -05:00
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@abdullah432 commented on GitHub (Jul 16, 2024):

@crazywoola @charli117 I'm still getting same problem, can you help me fixed it. Am I doing something wrong the way I'm calling the API?

@abdullah432 commented on GitHub (Jul 16, 2024): @crazywoola @charli117 I'm still getting same problem, can you help me fixed it. Am I doing something wrong the way I'm calling the API?
yindo commented 2026-02-21 18:07:19 -05:00
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@abdullah432 commented on GitHub (Jul 17, 2024):

@crazywoola @charli117 there is no way to mark this un-completed, should I file new issue because issue is not solved for me yet?

@abdullah432 commented on GitHub (Jul 17, 2024): @crazywoola @charli117 there is no way to mark this un-completed, should I file new issue because issue is not solved for me yet?
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Reference: langgenius/dify#4632
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