SDMX 3.0 data query URL syntax support in Tomcat

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The SDMX 3.0 REST API (API version 2) data query specification allows component predicates as an alternative to the series key patterns supported in SDMX 2.1 (API version 1).

Example: 

https://demo11.metadatatechnology.com/FusionRegistry/sdmx/v2/data/dataflow/ECB/EXR/1.0/?c[CURRENCY]=BRL&c[EXR_TYPE]=SP00&format=sdmx-compact-2.1

The component predicates are: 

c[CURRENCY]=BRL
c[EXR_TYPE]=SP00

Issue

The square brackets [] are reserved characters in the URL specification requiring generally that they are URL-encoded to avoid misinterpretation. 

c%5BCURRENCY%5D=BRL&c%5BEXR_TYPE%5D=SP00

%5B = [
%5D = ]

Some Fusion Registry deployment configurations will reject calls to the data query REST API unless the square brackets are URL-encoded

Relaxing URL reserved character checking in Apache Tomcat

Apache Tomcat can be configured to relax its checks for reserved characters and allow square brackets in URLs.

  • Under the Tomcat 'conf' directory, locate the server.xml file
  • Add the following attributes to the relevant Connector element
relaxedPathChars='[]|'
relaxedQueryChars='[]|{}^\`"<>'
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