# Python requests library **URL:** \ **Category:** Ignition\ **Tags:** ignition81, scripting\ **Created:** [May 19, 2022, 1:03pm UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778 "2022-05-19T13:03:11Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![louagejasper](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/louagejasper/32/86311_2.png) [@louagejasper](https://forum.inductiveautomation.com/u/louagejasper)\ **Post date:** [May 19, 2022, 1:03pm UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/1 "2022-05-19T13:03:11Z")
Hi, We try to use the requests library in Ignition (8.1.15). We get this error: ```auto Error running action 'component.onActionPerformed' on jasperlg@D/root/Button: Traceback (most recent call last): File "", line 2, in runAction ImportError: Error loading module requests: Traceback (most recent call last): File "", line 86, in File "", line 72, in getImage File "", line 48, in create_signed_jwt File "/usr/local/bin/ignition/user-lib/pylib/site-packages/jwt/api_jwt.py", line 64, in encode return super(PyJWT, self).encode( File "/usr/local/bin/ignition/user-lib/pylib/site-packages/jwt/api_jws.py", line 118, in encode raise NotImplementedError( NotImplementedError: Algorithm 'RS256' could not be found. Do you have cryptography installed? ``` We used pip for Jython, so we could import the library with all it’s dependencies, but it still asked for the cryptogrpahy library. I tried installing cryptography, but pip on jython refused to install it and gives this error: ```auto ERROR: Command errored out with exit status 1: command: /usr/local/jython/bin/jython /usr/local/jython/Lib/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-mmTpXJ/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.12; platform_python_implementation != '"'"'PyPy'"'"'' cwd: None Complete output (34 lines): WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.python.core.io.StreamIO (file:/usr/local/jython/jython.jar) to field java.io.FilterInputStream.in WARNING: Please consider reporting this to the maintainers of org.python.core.io.StreamIO WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release DEPRECATION: pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality. WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available. Collecting setuptools>=40.6.0 Using cached setuptools-44.1.1-py2.py3-none-any.whl (583 kB) Collecting wheel Using cached wheel-0.37.1-py2.py3-none-any.whl (35 kB) Collecting cffi>=1.12 Using cached cffi-1.15.0.tar.gz (484 kB) ERROR: Command errored out with exit status 1: command: /usr/local/jython/bin/jython -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-jXS2Lc/cffi/setup.py'"'"'; __file__ ='"'"'/tmp/pip-install-jXS2Lc/cffi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)( __file__ );code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__ , '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-8Qff1t cwd: /tmp/pip-install-jXS2Lc/cffi/ Complete output (15 lines): Traceback (most recent call last): File "", line 1, in File "/tmp/pip-install-jXS2Lc/cffi/setup.py", line 148, in ask_supports_thread() File "/tmp/pip-install-jXS2Lc/cffi/setup.py", line 76, in ask_supports_thread ok = (sys.platform != 'win32' and File "/usr/local/jython/Lib/distutils/command/config.py", line 232, in try_compile self._compile(body, headers, include_dirs, lang) File "/usr/local/jython/Lib/distutils/command/config.py", line 232, in try_compile self._compile(body, headers, include_dirs, lang) File "/usr/local/jython/Lib/distutils/command/config.py", line 136, in _compile (obj,) = self.compiler.object_filenames([src]) File "/usr/local/jython/Lib/distutils/ccompiler.py", line 821, in object_filenames if ext not in self.src_extensions: TypeError: 'NoneType' object is not iterable ---------------------------------------- ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output. ---------------------------------------- ERROR: Command errored out with exit status 1: /usr/local/jython/bin/jython /usr/local/jython/Lib/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-mmTpXJ/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.12; platform_python_implementation != '"'"'PyPy'"'"'' Check the logs for full command output. ``` Could it be that cryptography is CPython only? Or how come this can’t be installed? I had the same issue with the Pillow library. I also tried downloading the libraries manually (for Py2.7), but that gave an error in Ignition. I’m having a hard time debugging stuff like this. Any help here would be great. ---
**Author:** ![code\_skin](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@code\_skin](https://forum.inductiveautomation.com/u/code_skin)\ **Post date:** [May 19, 2022, 1:04pm UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/2 "2022-05-19T13:04:19Z")
I would recommend using httpClient() instead of requests.... [system.net.httpClient | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.1/appendix/scripting-functions/system-net/system-net-httpClient) More information about python libraries can be found here: [https://support.inductiveautomation.com/hc/en-us/articles/360056397252-Python-In-Ignition](https://support.inductiveautomation.com/hc/en-us/articles/360056397252-Python-In-Ignition) _edit_: updated doc link. ---
**Author:** ![Kevin.McClusky](https://avatars.discourse-cdn.com/v4/letter/k/47e85d/32.png) [@Kevin.McClusky](https://forum.inductiveautomation.com/u/Kevin.McClusky)\ **Post date:** [May 20, 2022, 12:25am UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/3 "2022-05-20T00:25:36Z")
`Could it be that cryptography is CPython only?` - Yes, that’s what’s happening here. If you look through the dependencies that pip is trying to install, you’ll see that it’s getting stuck on cffi. The cffi package is a “C Foreign Function Interface for Python”. As mentioned here, I’d definitely explore system.net.httpClient. It can do most of what requests does, and is normally really good at it. It might be a little less ‘pythonic’, but it’s very capable, and even gives you access to the underlying HttpClient / HttpRequest / HttpResponse objects if you need them. ---
**Author:** ![louagejasper](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/louagejasper/32/86311_2.png) [@louagejasper](https://forum.inductiveautomation.com/u/louagejasper)\ **Post date:** [May 20, 2022, 7:04am UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/4 "2022-05-20T07:04:50Z")
Thank you Kevin! That helps. Now I will have to find a way to encrypt my message RS256 with java libs probably. ---
**Author:** ![victordcq](https://avatars.discourse-cdn.com/v4/letter/v/f6c823/32.png) [@victordcq](https://forum.inductiveautomation.com/u/victordcq)\ **Post date:** [May 20, 2022, 8:15am UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/5 "2022-05-20T08:15:13Z")
urllib should work without having to install anything new. Haven’t used it myself though, the 2.7 version looks a bit outdated, but it seems to work. [https://docs.python.org/2/library/urllib.html](https://docs.python.org/2/library/urllib.html) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/0/90b28917ae5d64a270c2d68d9ab7d77368097bec.png) ---
**Author:** ![louagejasper](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/louagejasper/32/86311_2.png) [@louagejasper](https://forum.inductiveautomation.com/u/louagejasper)\ **Post date:** [May 20, 2022, 8:24am UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/6 "2022-05-20T08:24:36Z")
Yes, urllib works directly. Any idea on how to encrypt to RS256? ---
**Author:** ![victordcq](https://avatars.discourse-cdn.com/v4/letter/v/f6c823/32.png) [@victordcq](https://forum.inductiveautomation.com/u/victordcq)\ **Post date:** [May 20, 2022, 11:01am UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/7 "2022-05-20T11:01:40Z")
If you post to https, encryption should work automattically, i think. Otherwise no idea, you’ll have to find a lib or the correct algoritme xd ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [May 20, 2022, 12:06pm UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/8 "2022-05-20T12:06:57Z")
If you encounter international characters, urllib is likely to let you down in a jython environment. Use httpClient. ---
**Author:** ![louagejasper](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/louagejasper/32/86311_2.png) [@louagejasper](https://forum.inductiveautomation.com/u/louagejasper)\ **Post date:** [May 20, 2022, 2:25pm UTC](https://forum.inductiveautomation.com/t/python-requests-library/59778/9 "2022-05-20T14:25:08Z")
Yes, it worked with httpClient! Indeed, quite easy to implement. The Google cloud integration was a bit harder. If anyone needs to encrypt something with RS256 in Jython, you can do this: ```auto from java.security import KeyFactory from java.security import Signature from java.security.spec import PKCS8EncodedKeySpec from java.util import Base64 def signSHA256RSA(input, pkey): #Remove markers and new line characters in private key realPK = pkey.replace("-----END PRIVATE KEY-----", "") realPK = realPK.replace("-----BEGIN PRIVATE KEY-----", "") realPK = realPK.replace("\n", "") b1 = Base64.getDecoder().decode(realPK) spec = PKCS8EncodedKeySpec(b1) kf = KeyFactory.getInstance("RSA") privateSignature = Signature.getInstance("SHA256withRSA") privateSignature.initSign(kf.generatePrivate(spec)) privateSignature.update(str(input)) s = privateSignature.sign() return Base64.getUrlEncoder().encodeToString(s) ```