FastAPI路由报错：TypeError: root()缺少必需参数'request'

错误根源是你误用了Flask风格的@app.route装饰器，FastAPI不支持这种写法。它依赖自身的HTTP方法装饰器（如@app.get、@app.post等）来处理Request对象的自动注入逻辑，用错装饰器会导致Request参数无法被正确传递，从而触发报错。

修正后的代码如下：

from fastapi import FastAPI, Request

app = FastAPI()

# 使用FastAPI的GET方法装饰器，若需支持其他HTTP方法，可替换为对应装饰器
@app.get("/{full_path:path}")
async def root(full_path: str, request: Request):
    print(request.method, full_path)
    return "HIYO"

如果需要匹配所有HTTP方法，可以用api_route装饰器：

@app.api_route("/{full_path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
async def root(full_path: str, request: Request):
    print(request.method, full_path)
    return "HIYO"

内容的提问来源于stack exchange，提问作者Tangles