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https://issues.apache.org/jira/browse/NIFI-3125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15709519#comment-15709519
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Alec Wenzowski commented on NIFI-3125:
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[~joewitt] Yes, I'd missed that and now see the note in the UI when mousing
over the question mark. I agree with both point 1 and 2. On the subject of 2,
would like to update InvokeHTTP as well: each of my flows needs to be run on a
list of credentials. Is it possible the field restrictions made it difficult to
add EL support to these properties? Shall we split those two points into
separate issues?
Given the above, I tried adding the $\{nifi.service.api_key\} expression to the
Remote URL property instead. The expression still appears to be evaluated as if
the key has not been set: the expression is stripped from the url and no value
is interpolated. I am using another expression in this field which is
conditionally added to the flow by EvaluateJSONPath like so
`http://example.com?offset=${query.offset}` and which is behaving as expected.
> Cannot access custom properties from expression language
> --------------------------------------------------------
>
> Key: NIFI-3125
> URL: https://issues.apache.org/jira/browse/NIFI-3125
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.1.0
> Environment: $ sw_vers
> ProductName: Mac OS X
> ProductVersion: 10.12.1
> BuildVersion: 16B2555
> $ java -version
> java version "1.8.0_112"
> Java(TM) SE Runtime Environment (build 1.8.0_112-b16)
> Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode)
> Reporter: Alec Wenzowski
>
> Given a variable registry property file has been configured
> {code:title=conf/nifi.properties|borderStyle=solid}
> nifi.variable.registry.properties=./conf/service.properties
> {code}
> And it contains one valid key
> {code:title=conf/service.properties|borderStyle=solid}
> nifi.service.api_key=pony_foo
> {code}
> Upon booting nifi and inspecting I see
> {code:title=logs/nifi-app.log|borderStyle=solid}
> 745:2016-11-29 19:12:47,020 INFO [main]
> o.a.nifi.util.FileBasedVariableRegistry Loaded 1 properties from
> './conf/service.properties'
> {code}
> Yet when I configure a {{GetHTTP}} processor with its Username property set
> to the Value $\{nifi.service.api_key\} it issues HTTP requests without
> authentication–the configured HTTP Basic Authentication username of
> `pony_foo` is not used–and behaves as if the $\{nifi.service.api_key\} value
> has not been set.
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