How to Download a File After POSTing Data in FastAPI?
How to Download a File After POSTing Data with FastAPI
Problem
You're creating a web app that handles text input, converts it to speech, and returns an audio file for download. You need a download option on the HTML page, but you can't implement it properly.
In Flask, a similar setup could be achieved using the send_file function. How do you replicate this functionality with FastAPI?
FastAPI Code and HTML Example
<code class="python">from fastapi import FastAPI, File, Form, UploadFile
from fastapi.responses import FileResponse, HTMLResponse
from fastapi.templating import Jinja2Templates
from gtts import gTTS
templates = Jinja2Templates(directory="templates")
def text_to_speech(language: str, text: str) -> str:
tts = gTTS(text=text, lang=language, slow=False)
tts.save("./temp/welcome.mp3")
return "Text to speech conversion successful"
@app.get("/")
def home(request: Request):
return templates.TemplateResponse("index.html", {"request": request})
@app.post("/text2speech")
async def home(request: Request):
if request.method == "POST":
form = await request.form()
if form["message"] and form["language"]:
language = form["language"]
text = form["message"]
translate = text_to_speech(language, text)
path = "./temp/welcome.mp3"
value = FileResponse("./temp/welcome.mp3", media_type="audio/mp3")
return value</code><code class="html"><!doctype html>
<title>Download MP3 File</title>
<h2>Download a file</h2>
<p><a href="{{ url_for('text2speech') }}">Download</a></p></code>Solution
Option 1: Use the Form keyword to ensure required parameters. Instead of using await request.form() and manually checking for required parameters, use Form(...) to make parameters mandatory. After processing the received data, use FileResponse to return the file, setting the Content-Disposition header to 'attachment.'
Option 2: You can also support both GET and POST requests for the /text2speech endpoint by using decorators like @app.api_route("/text2speech", methods=["GET", "POST"]). Alternatively, you can define separate endpoints with @app.get("/text2speech") and @app.post("/text2speech").
Additionally, you can optionally set up a JavaScript interface using Fetch API to download the file in the frontend.
Note:
- If you want to return a large file that doesn't fit into memory, use StreamingResponse to process the file in chunks.
- To remove a file after it's downloaded, create a BackgroundTask to be run after returning the response.
The above is the detailed content of How to Download a File After POSTing Data in FastAPI?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1655
14
1414
52
1307
25
1254
29
1228
24
Python vs. C : Applications and Use Cases Compared
Apr 12, 2025 am 12:01 AM
Python is suitable for data science, web development and automation tasks, while C is suitable for system programming, game development and embedded systems. Python is known for its simplicity and powerful ecosystem, while C is known for its high performance and underlying control capabilities.
How Much Python Can You Learn in 2 Hours?
Apr 09, 2025 pm 04:33 PM
You can learn the basics of Python within two hours. 1. Learn variables and data types, 2. Master control structures such as if statements and loops, 3. Understand the definition and use of functions. These will help you start writing simple Python programs.
Python: Games, GUIs, and More
Apr 13, 2025 am 12:14 AM
Python excels in gaming and GUI development. 1) Game development uses Pygame, providing drawing, audio and other functions, which are suitable for creating 2D games. 2) GUI development can choose Tkinter or PyQt. Tkinter is simple and easy to use, PyQt has rich functions and is suitable for professional development.
The 2-Hour Python Plan: A Realistic Approach
Apr 11, 2025 am 12:04 AM
You can learn basic programming concepts and skills of Python within 2 hours. 1. Learn variables and data types, 2. Master control flow (conditional statements and loops), 3. Understand the definition and use of functions, 4. Quickly get started with Python programming through simple examples and code snippets.
Python vs. C : Learning Curves and Ease of Use
Apr 19, 2025 am 12:20 AM
Python is easier to learn and use, while C is more powerful but complex. 1. Python syntax is concise and suitable for beginners. Dynamic typing and automatic memory management make it easy to use, but may cause runtime errors. 2.C provides low-level control and advanced features, suitable for high-performance applications, but has a high learning threshold and requires manual memory and type safety management.
Python and Time: Making the Most of Your Study Time
Apr 14, 2025 am 12:02 AM
To maximize the efficiency of learning Python in a limited time, you can use Python's datetime, time, and schedule modules. 1. The datetime module is used to record and plan learning time. 2. The time module helps to set study and rest time. 3. The schedule module automatically arranges weekly learning tasks.
Python: Exploring Its Primary Applications
Apr 10, 2025 am 09:41 AM
Python is widely used in the fields of web development, data science, machine learning, automation and scripting. 1) In web development, Django and Flask frameworks simplify the development process. 2) In the fields of data science and machine learning, NumPy, Pandas, Scikit-learn and TensorFlow libraries provide strong support. 3) In terms of automation and scripting, Python is suitable for tasks such as automated testing and system management.
Python: Automation, Scripting, and Task Management
Apr 16, 2025 am 12:14 AM
Python excels in automation, scripting, and task management. 1) Automation: File backup is realized through standard libraries such as os and shutil. 2) Script writing: Use the psutil library to monitor system resources. 3) Task management: Use the schedule library to schedule tasks. Python's ease of use and rich library support makes it the preferred tool in these areas.
