HttpClient/Connector configuration for resolver

[Hrvoje Hodak]

Hi all,

I'm trying to figure out how to get attributes from a REST-API. I can't
seem to understand the documentation for that matter. I've used the
example [1] and replaced the URLTemplate with:

https://<url>:<port>/api/Attributes/GetUIDData?uid=<uid>

I understand that attributes can't be retrieved this way, since the
URL doesn't work with the script in the example, but this is not the
problem right now, since I can't even connect to the server. 

I've also created a new beans as per [2], see below. But I'm getting the
following error:

```
Attribute Resolver 'ShibbolethAttributeResolver': Data connector 'HTTP'
failed
net.shibboleth.idp.attribute.resolver.ResolutionException: Data
Connector 'HTTP': HTTP request failed
  at
  net.shibboleth.idp.attribute.resolver.dc.http.impl.HTTPDataConnector.retrieveAttributes(HTTPDataConnector.java:123)
Caused by: java.net.SocketException: Connection reset
    at
	java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:328)
```

Beans: 

```
<bean id="myHTTP"
  parent="shibboleth.HttpClientFactory"
  p:connectionProxyHost="<url>"
  p:connectionProxyPort="<port>"
/>

<bean id="ExampleOrgWSSecurity"
  class="org.opensaml.security.httpclient.HttpClientSecurityParameters">
  <property name="tLSTrustEngine">
    <bean parent="shibboleth.StaticExplicitTrustEngine"
      p:certificates="%{idp.home}/credentials/cert.pem" />
  </property>
</bean>
```

[1]: https://shibboleth.atlassian.net/wiki/spaces/IDP5/pages/3199503637/HTTPConnector
[2]: https://shibboleth.atlassian.net/wiki/spaces/IDP5/pages/3199510442/HttpClientConfiguration
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