fastapi的docs页面是空白解决

时间:2024-10-17 12:51:58

环境:openEuler、python 3.11.6、fastapi 0.115.2

背景:居家办公,默认搭建的fastapi的docs接口为空白

时间:20241016

说明:网上很多教程的缺点是复杂(但是能够了解的更清楚),使用官方文档解决很便利

官方文档地址:Custom Docs UI Static Assets

 1、搭建环境

 安装相应的python包

pip install fastapi uvicorn

创建main文件:

# main.py
from fastapi import FastAPI
app = FastAPI()

@app.get("/") # 根路由
async def root():
    return "I want to change the world"

if __name__ == "__main__":
    
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)

# 启动命令:uvicorn main:app --reload --host 0.0.0.0 --port 8000

运行测试:

说明启动成功

(venv) [jack@Laptop-L14-gen4 fastTest]$ uvicorn main:app --reload --host 0.0.0.0 --port 8000
INFO:     Will watch for changes in these directories: ['/home/jack/fastTest']
INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [6119] using StatReload
INFO:     Started server process [6121]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

 浏览器查看

 至此,说明基本环境搭建完毕

2、问题发现

默认访问 http://172.26.20.199:8000/docs 应该如下:

可问题却是空白

 原因分析:

fastapi的文件是提供的CDN为国外的网址,偶尔可能存在网络延迟,导致为空白,使用F12可以看到是文件获取不到

3、解决问题

第一种方式的再试试,存在这种可能性

第二种方式为复制官方文档提供的部分代码:

# 增加的代码部分

from fastapi.openapi.docs import (
    get_redoc_html,
    get_swagger_ui_html,
    get_swagger_ui_oauth2_redirect_html,
)

app = FastAPI(docs_url=None, redoc_url=None)


@app.get("/docs", include_in_schema=False)
async def custom_swagger_ui_html():
    return get_swagger_ui_html(
        openapi_url=app.openapi_url,
        title=app.title + " - Swagger UI",
        oauth2_redirect_url=app.swagger_ui_oauth2_redirect_url,
        swagger_js_url="https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js",
        swagger_css_url="https://unpkg.com/swagger-ui-dist@5/swagger-ui.css",
    )

上述代码完全无脑复制到你的main.py中,覆盖app = 这一行即可,复制完如下:

# main.py
from fastapi import FastAPI

from fastapi.openapi.docs import (
    get_redoc_html,
    get_swagger_ui_html,
    get_swagger_ui_oauth2_redirect_html,
)

app = FastAPI(docs_url=None, redoc_url=None)


@app.get("/docs", include_in_schema=False)
async def custom_swagger_ui_html():
    return get_swagger_ui_html(
        openapi_url=app.openapi_url,
        title=app.title + " - Swagger UI",
        oauth2_redirect_url=app.swagger_ui_oauth2_redirect_url,
        swagger_js_url="https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js",
        swagger_css_url="https://unpkg.com/swagger-ui-dist@5/swagger-ui.css",
    )

@app.get("/") # 根路由
async def root():
    return "I want to change the world"

if __name__ == "__main__":
    
    
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)

# 启动命令:uvicorn main:app --reload --host 0.0.0.0 --port 8000

保存,fastapi会自动重新加载,刷新网页即可。