Flask Api to parse xml post requests returning errors

Question

I am writing a python-flask api to parse and manipulate xml using xml to dict. Below is my initial code:

from flask import Flask, jsonify, abort, make_response, request, 
render_template
import sys, sqlite3, requests, datetime, time, re, json, optparse
import xmltodict
import helpers
import platform
app = Flask(__name__)

start = int(round(time.time()))
print("api running")

@app.route("/", methods=['GET', 'POST'])
def parse_xml():
    content_dict = xmltodict.parse(request.data)
    return content_dict

if __name__ == '__main__':
    print("Starting python app")
    app.run(host='0.0.0.0', port=8080, debug=False)

The following curl request: curl -H "Authorization: Bearer Token" -X POST -d '<xml><From>Jack</From><Body>Hello, it worked!</Body></xml>' url

Returns the errors:

2018-04-18T13:33:38.831293275Z [2018-04-18 13:33:38,830] ERROR in app: Exception on / [POST] 2018-04-18T13:33:38.831324305Z Traceback (most recent call last): 2018-04-18T13:33:38.831331225Z File "/usr/lib/python2.7/site-packages/flask/app.py", line 1982, in wsgi_app 2018-04-18T13:33:38.831336961Z response = self.full_dispatch_request() 2018-04-18T13:33:38.83134283Z File "/usr/lib/python2.7/site-packages/flask/app.py", line 1614, in full_dispatch_request 2018-04-18T13:33:38.831352063Z rv = self.handle_user_exception(e) 2018-04-18T13:33:38.831357531Z File "/usr/lib/python2.7/site-packages/flask/app.py", line 1517, in handle_user_exception 2018-04-18T13:33:38.83136302Z
reraise(exc_type, exc_value, tb) 2018-04-18T13:33:38.831367481Z File "/usr/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request 2018-04-18T13:33:38.831372038Z rv = self.dispatch_request() 2018-04-18T13:33:38.831377673Z File "/usr/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request 2018-04-18T13:33:38.831385927Z return self.view_functionsrule.endpoint 2018-04-18T13:33:38.831391913Z File "/src/simpleapp.py", line 14, in parse_xml 2018-04-18T13:33:38.831396571Z content_dict = xmltodict.parse(request.data) 2018-04-18T13:33:38.831401027Z File "/usr/lib/python2.7/site-packages/xmltodict.py", line 330, in parse 2018-04-18T13:33:38.831407166Z parser.Parse(xml_input, True) 2018-04-18T13:33:38.831412259Z ExpatError: no element found: line 1, column 0 2018-04-18T13:33:38.831705887Z 100.96.2.171 - - [18/Apr/2018 13:33:38] "POST / HTTP/1.1" 500 -

Any help would be appreciated, thank you.

Joost · Accepted Answer · 2018-04-18 22:22:35Z

4

You have to change you're curl request to be key=value pairs for easy handling.

Curl:

 curl -H "Authorization: Bearer Token" -X POST -d 'SomeKey=<xml><From>Jack</From><Body>Hello, it worked!</Body></xml>' http://127.0.0.1:5000

Python:

from flask import Flask, jsonify, request
import xmltodict

app = Flask(__name__)

@app.route("/", methods=['GET', 'POST'])
def parse_xml():
    xml_data = request.form['SomeKey']
    content_dict = xmltodict.parse(xml_data)
    return jsonify(content_dict)

Response:

{
  "xml": {
      "Body": "Hello, it worked!",
      "From": "Jack"
  }
}

answered Apr 18, 2018 at 22:22

Joost

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Comments

Alex · Accepted Answer · 2018-04-18 23:04:45Z

2

You could also use curl to post XML file content:

curl -X POST -d @data.xml  -H 'Accept: application/xml'  -H 'Content-Type: application/xml' url

data.xml content:

<xml>
 <From>Jack</From>
 <Body>Hello, it worked!</Body>
</xml>

answered Apr 18, 2018 at 23:04

Alex

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