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Dockerfile

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+# 使用一个轻量级的 Python 官方镜像
+FROM python:3.10-slim
+
+# 设置工作目录
+WORKDIR /code
+
+# 复制依赖文件并安装依赖
+COPY ./requirements.txt /code/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+# 复制所有应用代码到工作目录
+COPY ./app.py /code/app.py
+COPY ./midi_utils.py /code/midi_utils.py
+
+# 暴露 Hugging Face Spaces 期望的端口 7860
+EXPOSE 7860
+
+# 启动 Uvicorn 服务器，并添加 --proxy-headers 标志
+# 这是解决 /docs 404 问题的关键
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860", "--proxy-headers"]

app.py

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+from fastapi import FastAPI, UploadFile, File
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import StreamingResponse, JSONResponse
+from midi_utils import process_midi
+
+# We no longer need os or ROOT_PATH here, keeping the code clean.
+# Uvicorn with --proxy-headers will handle the path prefix automatically.
+app = FastAPI(
+    title="MIDI Processor API",
+    description="A pure API backend to process MIDI files, running correctly behind a proxy.",
+    version="1.0.2", # Version updated for the final fix
+)
+
+# --- CORS Middleware (no change) ---
+origins = ["*"]
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=origins,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# --- API Endpoints (no change) ---
+
+@app.get("/", tags=["General"])
+def read_root():
+    # The /docs link will now work correctly without us manually building the path.
+    return {
+        "message": "Welcome to the MIDI Processor API!",
+        "status": "ok",
+        "documentation_url": "/docs" # FastAPI will resolve this correctly now
+    }
+
+@app.post("/process-midi", tags=["MIDI Processing"])
+async def process_midi_file(file: UploadFile = File(..., description="The MIDI file (.mid, .midi) to be processed.")):
+    if not file.filename.lower().endswith(('.mid', '.midi')):
+        return JSONResponse(
+            status_code=400,
+            content={"error": "Invalid file type. Please upload a .mid or .midi file."}
+        )
+    try:
+        print(f"Processing file: {file.filename}")
+        midi_data = await file.read()
+        processed_data_buffer = process_midi(midi_data)
+        return StreamingResponse(
+            processed_data_buffer,
+            media_type="audio/midi",
+            headers={"Content-Disposition": f"attachment; filename=processed_{file.filename}"}
+        )
+    except Exception as e:
+        print(f"An error occurred while processing the file: {e}")
+        return JSONResponse(
+            status_code=500,
+            content={"error": "An internal server error occurred during MIDI processing.", "detail": str(e)}
+        )

midi_utils.py

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+import mido
+from io import BytesIO
+
+def process_midi(midi_bytes: bytes) -> BytesIO:
+    """处理MIDI文件：将所有音符提高一个半音"""
+    with BytesIO(midi_bytes) as input_buffer:
+        mid = mido.MidiFile(file=input_buffer)
+        
+        for track in mid.tracks:
+            for msg in track:
+                if msg.type in ['note_on', 'note_off']:
+                    if msg.note < 127:
+                        msg.note += 1
+        
+        output_buffer = BytesIO()
+        mid.save(file=output_buffer)
+        output_buffer.seek(0)
+        
+        return output_buffer

requirements.txt

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+fastapi
+uvicorn
+mido==1.2.10
+python-multipart