webread examples don't work

Question

YW il 22 Set 2016

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https://it.mathworks.com/matlabcentral/answers/304141-webread-examples-don-t-work

Modificato: per isakson il 16 Ago 2017

I tried to find out how webread works. Following examples don't work for me.

>> filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
fullList = webread(filex);
Error using readContentFromWebService (line 45)
The server returned the message: "Server redirected too many  times (20)" for URL,
'http://nroyaltonproxy:8889/?cfru=aHR0cDovL3d3dy5tYXRod29ya3MuY29tL21hdGxhYmNlbnRyYWwvZmlsZWV4Y2hhbmdlLw=='
(with HTTP response code unknown).
Error in webread (line 122)
[varargout{1:nargout}] = readContentFromWebService(connection, options);

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lotus whit il 16 Ago 2017

Modificato: per isakson il 16 Ago 2017

Apri in MATLAB Online

I have the same problem when i called Google translation API, this is my code

     url = 'https://translation.googleapis.com/language/translate/v2'
     options.KeyName = 'apikey';
     options.RequestMethod ='Get';
     Options.ContentType ='Josn';
     options.KeyValue='XXXXXX';
     response = webread(url,options)

the following error appeared :

Error using readContentFromWebService (line 37)
The server returned the message: "Forbidden" for URL, 
'https://translation.googleapis.com/language/translate/v2' (with
HTTP response code 403).
Error in webread (line 115)
[varargout{1:nargout}] = readContentFromWebService(connection, options);

I filled key value as it is in my console, any one help?

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Answer 1

Walter Roberson il 22 Set 2016

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https://it.mathworks.com/matlabcentral/answers/304141-webread-examples-don-t-work#answer_235753

Apri in MATLAB Online

You appear to be using a http proxy that is having difficulty with the site.

When I use telnet directly to the webserver port and make the request, I do not receive any redirect messages at all.

Oni:~ roberson$ telnet www.mathworks.com 80
Trying 23.4.13.144...
Connected to e6779.b.akamaiedge.net.
Escape character is '^]'.
GET http://www.mathworks.com/matlabcentral/fileexchange/ HTTP/1.0
HTTP/1.0 200 OK
Server: Apache/2.2.3 (CentOS)
X-UA-Compatible: IE=Edge,chrome=1
ETag: "6aac7270871d08f05076ae85c7d9b998"
X-Request-Id: d73f63c54278a9d1730b2e1f23605a5f
X-Runtime: 0.044456
X-Rack-Cache: miss
X-Powered-By: Phusion Passenger 4.0.59
Status: 200 OK
Content-Type: text/html; charset=utf-8
Expires: Thu, 22 Sep 2016 22:36:15 GMT
Cache-Control: max-age=0, no-cache, no-store
Pragma: no-cache
Date: Thu, 22 Sep 2016 22:36:15 GMT
Content-Length: 26612
Connection: close
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

(etc)

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Kirby Fears il 3 Ott 2016

Modificato: Kirby Fears il 3 Ott 2016

Apri in MATLAB Online

Since you're able to successfully visit that website in your browser, you can try manually changing the user agent so Matlab pretends to be a web browser. If this works, you can ask your IT support to allow for Matlab as a user agent.

opts = weboptions('UserAgent','Mozilla/5.0');
filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
fullList = webread(filex,opts);

Wyfi Mcfly il 3 Apr 2017

worked for my issue, thanks!

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Answer 2

YW il 4 Ott 2016

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https://it.mathworks.com/matlabcentral/answers/304141-webread-examples-don-t-work#answer_237341

Modificato: Walter Roberson il 4 Ott 2016

Apri in MATLAB Online

Still didn't work. See below:

>> opts = weboptions('UserAgent','Mozilla/5.0')
opts = 
    weboptions with properties:
      CharacterEncoding: 'auto'
              UserAgent: 'Mozilla/5.0'
                Timeout: 5
               Username: ''
               Password: ''
                KeyName: ''
               KeyValue: ''
            ContentType: 'auto'
          ContentReader: []
              MediaType: 'application/x-www-form-urlencoded'
          RequestMethod: 'auto'
            ArrayFormat: 'csv'
>> filex = 'http://www.mathworks.com/matlabcentral/fileexchange/'
filex =
http://www.mathworks.com/matlabcentral/fileexchange/
>> fullList = webread(filex,opts)
*Error using readContentFromWebService (line 45)
The server returned the message: "Server redirected too many  times (20)" for
URL,
'http://nroyaltonproxy:8889/?cfru=aHR0cDovL3d3dy5tYXRod29ya3MuY29tL21hdGxhYmNlbnRyYWwvZmlsZWV4Y2hhbmdlLw=='
(with HTTP response code unknown).
Error in webread (line 122)
[varargout{1:nargout}] = readContentFromWebService(connection, options);*