Special Characters Issue When Consuming API with Flutter/Dart

[xsampedro]

Issue Description

I've encountered an encoding issue when consuming the web service using the Flutter/Dart HTTP client. The client seems to default to latin1 encoding when the Content-Type header lacks a specified charset, resulting in misinterpreted special characters.

Impact

This issue impacts any client that relies on the Content-Type header to determine the correct character encoding. Since the Flutter/Dart HTTP client defaults to latin1, it incorrectly decodes responses that include special characters, assuming the absence of a charset=utf-8 in the Content-Type header.

Steps to Reproduce

1. Consume the API endpoint using Flutter/Dart HTTP client.
2. Notice special characters are not displayed correctly.

Proposed Solution

To resolve this issue, I suggest explicitly setting the charset in the Content-Type header for JSON responses. This can be implemented in the _process_api_query function.

from fastapi.responses import JSONResponse

# Modify the _process_api_query function to return a JSONResponse with charset=utf-8
if not use_csv:
    return JSONResponse(content=results, media_type="application/json; charset=utf-8")
else:
    # Existing CSV handling logic

By specifying charset=utf-8 in the Content-Type header, clients like Flutter/Dart should correctly interpret the response encoding as UTF-8.

[PrestonHager]

@xsampedro has your issue been fixed with the release of v1.0? I have not seen issues on my projects yet.