I'm trying to make a request to the GitHub API with Python 3 urllib
to create a release, but I made some mistake and it fails with an exception:
Traceback (most recent call last):
File "./a.py", line 27, in <module>
'Authorization': 'token ' + token,
File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python3.6/urllib/request.py", line 532, in open
response = meth(req, response)
File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python3.6/urllib/request.py", line 570, in error
return self._call_chain(*args)
File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
result = func(*args)
File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 422: Unprocessable Entity
GitHub however is nice, and explains why it failed on the response body as shown at: 400 vs 422 response to POST of data
So, how do I read the response body? Is there a way to prevent the exception from being raised?
I've tried to catch the exception and explore it in ipdb
, which gives an object of type urllib.error.HTTPError
but I couldn't find that body data there, only headers.
The script:
#!/usr/bin/env python3
import json
import os
import sys
from urllib.parse import urlencode
from urllib.request import Request, urlopen
repo = sys.argv[1]
tag = sys.argv[2]
upload_file = sys.argv[3]
token = os.environ['GITHUB_TOKEN']
url_template = 'https://{}.github.com/repos/' + repo + '/releases'
# Create.
_json = json.loads(urlopen(Request(
url_template.format('api'),
json.dumps({
'tag_namezxcvxzcv': tag,
'name': tag,
'prerelease': True,
}).encode(),
headers={
'Accept': 'application/vnd.github.v3+json',
'Authorization': 'token ' + token,
},
)).read().decode())
# This is not the tag, but rather some database integer identifier.
release_id = _json['id']
usage: Can someone give a python requests example of uploading a release asset in github?
URLError – It is raised for the errors in URLs, or errors while fetching the URL due to connectivity, and has a 'reason' property that tells a user the reason of error. HTTPError – It is raised for the exotic HTTP errors, such as the authentication request errors. It is a subclass or URLError.
request is a Python module for fetching URLs (Uniform Resource Locators). It offers a very simple interface, in the form of the urlopen function. This is capable of fetching URLs using a variety of different protocols.
The HTTPError
has a read()
method that allows you to read the response body. So in your case, you should be able to do something such as:
try:
body = urlopen(Request(
url_template.format('api'),
json.dumps({
'tag_namezxcvxzcv': tag,
'name': tag,
'prerelease': True,
}).encode(),
headers={
'Accept': 'application/vnd.github.v3+json',
'Authorization': 'token ' + token,
},
)).read().decode()
except urllib.error.HTTPError as e:
body = e.read().decode() # Read the body of the error response
_json = json.loads(body)
The docs explain in more detail how the HTTPError
instance can be used as a response, and some of its other attributes.
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