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Webread certificate problems - roll your own java works, webread doesn't. Why?

71 Ansichten (letzte 30 Tage)
Could someone explain to me why this would fail with an obscure message
webread('http://website/', 'Authorization', ['Basic ' matlab.net.base64encode(['me:secr3t'])])
The reason is "error:14090086:SSL routines:ssl3_get_server_certificate:certificate
verify failed". Check your certificate file (C:\Program Files\MATLAB\R2018a\sys\certificates\ca\rootcerts.pem) for expired, missing or invalid certificates.
Whereas this (lightly modified and shamelessly stolen from stack overflow) appears to have no problems. Is webread doing something kooky that causes it to barf on the proxy server, where java is not? Why does matlab have certificate problems?
urlread_auth('https://website/','me','secr3t' )
function [s,info] = urlread_auth(url, user, password)
%URLREAD_AUTH Like URLREAD, with basic authentication
%
% [s,info] = urlread_auth(url, user, password)
%
% Returns bytes. Convert to char if you're retrieving text.
%
% Examples:
% sampleUrl = 'http://browserspy.dk/password-ok.php';
% [s,info] = urlread_auth(sampleUrl, 'test', 'test');
% txt = char(s)
% Matlab's urlread() doesn't do HTTP Request params, so work directly with Java
jUrl = java.net.URL(url);
conn = jUrl.openConnection();
conn.setRequestProperty('Authorization', ['Basic ' matlab.net.base64encode([user ':' password])]);
conn.connect();
info.status = conn.getResponseCode();
info.errMsg = char(readstream(conn.getErrorStream()));
s = readstream(conn.getInputStream());
end
function out = readstream(inStream)
%READSTREAM Read all bytes from stream to uint8
try
import com.mathworks.mlwidgets.io.InterruptibleStreamCopier;
byteStream = java.io.ByteArrayOutputStream();
isc = InterruptibleStreamCopier.getInterruptibleStreamCopier();
isc.copyStream(inStream, byteStream);
inStream.close();
byteStream.close();
out = typecast(byteStream.toByteArray', 'uint8'); %'
catch err
out = []; %HACK: quash
end
end
  2 Kommentare
Jörgen
Jörgen am 26 Jan. 2018
I solved it by setting the options=weboptions; options.CertificateFilename=(''); webread(URL,options);

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Akzeptierte Antwort

Simon Parten
Simon Parten am 26 Jan. 2018
Bearbeitet: Walter Roberson am 2 Mär. 2019
""" I solved it by setting the options=weboptions; options.CertificateFilename=(''); webread(URL,options); """
I also then needed to set the RequestMethod as POST, and crucially, use the 'webwrite' function, as opposed to the 'webread' function. Suddenly, things burst into life ...

Weitere Antworten (1)

Darshan Ramakant Bhat
Darshan Ramakant Bhat am 17 Jan. 2018
There is a detailed answer available for the similar issue in the below answer link:
I hope this will help you.
  1 Kommentar
Adam Schroeder
Adam Schroeder am 14 Mär. 2022
It looks like this link is no longer active. I was able to work through this successfully using Simon's accepted answer and Jörgen's comment.
options=weboptions;
options.CertificateFilename=('');
webread(URL,options);

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