getting full HTTP response to HTTP request in urlread

2011 3 10
1 个回答
回答已采纳
3 次查看（30 天）

0 个投票

Currently urlread uses the command: urlConnection.getInputStream
and then proceeds to do something fairly confusing to me with copying streams via some unsupported stream copier to produce the final output
Unfortunately when there is an error in my request I get nebulous errors instead of the actual error response. Even when I get a successful request, I am still unable to see the headers which can contain important information for what I am doing.
Example error: java.io.IOException: Server returned HTTP response code: 400 for URL:
By using Matlab's proxy settings I can observe the details of the requests through "Fiddler", which has been most helpful, but it would be nice to be able to observe things more concretely in Matlab.

请先登录，再回答此问题。

 采纳的回答

Jim Hokanson
Jim Hokanson 2011-3-17

1 个投票

Here's my answer to this problem, although it might have some bugs ...
getHeaderField was needed, note getHeaderField(0) is the response like 400 or 401
In addition, I added getErrorStream, which the server I am working with sends when there is an error
I still don't like the stream copier ...
allHeaders = struct('Response',char(urlConnection.getHeaderField(0)));
done = false;
headerIndex = 0;
while ~done
headerIndex = headerIndex + 1;
headerValue = char(urlConnection.getHeaderField(headerIndex));
if ~isempty(headerValue)
headerName = char(urlConnection.getHeaderFieldKey(headerIndex));
headerName(headerName == '-') = '_';
allHeaders(1).(headerName) = headerValue;
else
done = true;
end
end
status = struct('value',urlConnection.getResponseCode(),...
'msg',char(urlConnection.getResponseMessage));
isGood = true;
try
inputStream = urlConnection.getInputStream;
catch ME
try
inputStream = urlConnection.getErrorStream;
catch ME %#ok<*NASGU>
isGood = false;
end
end
if isGood
byteArrayOutputStream = java.io.ByteArrayOutputStream;
% This StreamCopier is unsupported and may change at any time. OH GREAT :/
isc = InterruptibleStreamCopier.getInterruptibleStreamCopier;
isc.copyStream(inputStream,byteArrayOutputStream);
inputStream.close;
byteArrayOutputStream.close;
output = native2unicode(typecast(byteArrayOutputStream.toByteArray','uint8'),'UTF-8');
else
output = '';
end

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Jim Hokanson
Jim Hokanson 2011-6-30
This code appears to work fine with the exception of cookies since the Set-Cookie header can be repeated (maybe others?). Maybe I'll eventually get around to releasing a urlread v2.0, with much more support for both request and response headers ...
Ray Lee
Ray Lee 2013-5-6
so, have u released your urlread v2?
Jim Hokanson
Jim Hokanson 2013-7-7
Yes. It is available on the FEX exchange. http://www.mathworks.com/matlabcentral/fileexchange/35693-urlread2
For an outline of the code see: http://undocumentedmatlab.com/blog/expanding-urlreads-capabilities/
I'm also currently working on a v3 (not sure of the name yet). It will be class based and provide a much more intuitive interface for constructing input parameters and parsing output parameters.
In particular the outline will be: 1) Create request object 2) Modify request properties via methods 3) Make request, get response object

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 App Building 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by