我有以下烧瓶应用程序
fileform.html：
<html>
<head>
<title>Simple file upload using Python Flask</title>
</head>
<body>
<form action="/getSignature" method="post" enctype="multipart/form-data">
Choose the file: <input type="file" name="photo"/><BR>
<input type="submit" value="Upload"/>
</form>
</body>
</html>
app.py：
import os
from flask import Flask, request, render_template, url_for, redirect
app = Flask(__name__)
@app.route("/")
def fileFrontPage():
return render_template('fileform.html')
@app.route("/getSignature", methods=['POST'])
def handleFileUpload():
if 'photo' in request.files:
photo = request.files['photo']
if photo.filename != '':
filepath = os.path.join('/flask/files', photo.filename)
photo.save(filepath)
return render_template('result.html')
if __name__ == '__main__':
app.run(host='0.0.0.0', port=5000)
这适用于较小的文件，但不适用于较大的文件。单击Upload按钮后，浏览器显示(Uploading 13%..)，然后浏览器超时并显示ERR_CONNECTION_RESET。在烧瓶应用程序中看不到任何错误。
我正在通过Nginx服务。当我检查nginx日志时，我看到
2020/02/20 22:38:47 [error] 6#6: *170614 client intended to send too large body: 80762097 bytes, client: 10.2.16.178, server: localhost, request: "POST /getSignature
是否需要为此添加任何Nginx配置？
我要上传最大为100Mb的文件。
来自https://flask.palletsprojects.com/en/1.1.x/patterns/fileuploads/：
连接重置问题
使用本地开发服务器时，您可能会收到连接重置错误，而不是413响应。你会在生产环境中运行应用程序时获得正确的状态响应WSGI服务器。
解决方案：不要使用开发服务器，请设置真实的WSGI服务器
您看过分块吗？它使您可以将文件和数据分解为离散的片段，以通过有线发送。并且您将有两个主要部分：前端和后端。对于前端，您可以使用类似Dropzone.js.的名称。但是，您需要启用分块行为，因为默认情况下它不包含在内。幸运的是，它确实很容易启用。
可能会像这样完成：
<html>
<meta charset="UTF-8">
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.4.0/min/dropzone.min.css"/>
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.4.0/min/basic.min.css"/>
<script type="application/javascript"
src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.4.0/min/dropzone.min.js">
</script>
<head>
<title>Simple file upload using Python Flask</title>
</head>
<form method="POST" action='/upload' class="dropzone dz-clickable"
id="dropper" enctype="multipart/form-data">
</form>
<script type="application/javascript">
Dropzone.options.dropper = {
paramName: 'file',
chunking: true,
forceChunking: true,
url: '/upload',
maxFilesize: 1025, // megabytes
chunkSize: 1000000 // bytes
}
</script>
</html>
并且下面的flask示例将处理后端：
import logging
import os
from flask import render_template, Blueprint, request, make_response
from werkzeug.utils import secure_filename
from pydrop.config import config
blueprint = Blueprint('templated', __name__, template_folder='templates')
log = logging.getLogger('pydrop')
@blueprint.route('/')
@blueprint.route('/index')
def index():
# Route to serve the upload form
return render_template('index.html',
page_name='Main',
project_name="pydrop")
@blueprint.route('/upload', methods=['POST'])
def upload():
file = request.files['file']
save_path = os.path.join(config.data_dir, secure_filename(file.filename))
current_chunk = int(request.form['dzchunkindex'])
# If the file already exists it's ok if we are appending to it,
# but not if it's new file that would overwrite the existing one
if os.path.exists(save_path) and current_chunk == 0:
# 400 and 500s will tell dropzone that an error occurred and show an error
return make_response(('File already exists', 400))
try:
with open(save_path, 'ab') as f:
f.seek(int(request.form['dzchunkbyteoffset']))
f.write(file.stream.read())
except OSError:
# log.exception will include the traceback so we can see what's wrong
log.exception('Could not write to file')
return make_response(("Not sure why,"
" but we couldn't write the file to disk", 500))
total_chunks = int(request.form['dztotalchunkcount'])
if current_chunk + 1 == total_chunks:
# This was the last chunk, the file should be complete and the size we expect
if os.path.getsize(save_path) != int(request.form['dztotalfilesize']):
log.error(f"File {file.filename} was completed, "
f"but has a size mismatch."
f"Was {os.path.getsize(save_path)} but we"
f" expected {request.form['dztotalfilesize']} ")
return make_response(('Size mismatch', 500))
else:
log.info(f'File {file.filename} has been uploaded successfully')
else:
log.debug(f'Chunk {current_chunk + 1} of {total_chunks} '
f'for file {file.filename} complete')
return make_response(("Chunk upload successful", 200))
可能内容长度被限制为默认值。
当您使用nginx时，可能是上游玩游戏超时（上游keepalive_timeout 60s的默认设置）将以下设置添加到nginx：
keepalive_timeout 900s;
#extra
proxy_read_timeout 900s;
uwsgi_read_timeout 900s;
更多调音here
并且，如果您使用uwsgi之类的python wsgi服务器，也请在此处设置keep alive：
http-keepalive 900;