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https://issues.apache.org/jira/browse/KNOX-2559?focusedWorklogId=576051&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-576051
 ]

ASF GitHub Bot logged work on KNOX-2559:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Apr/21 12:16
            Start Date: 02/Apr/21 12:16
    Worklog Time Spent: 10m 
      Work Description: mudit-97 commented on a change in pull request #423:
URL: https://github.com/apache/knox/pull/423#discussion_r606210158



##########
File path: 
gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/ConfigurableDispatch.java
##########
@@ -41,13 +47,26 @@
 public class ConfigurableDispatch extends DefaultDispatch {
   private Set<String> requestExcludeHeaders = 
super.getOutboundRequestExcludeHeaders();
   private Set<String> responseExcludeHeaders = 
super.getOutboundResponseExcludeHeaders();
+  private Map<String, String> requestAppendHeaders = new HashMap<>();
   private Set<String> responseExcludeSetCookieHeaderDirectives = 
super.getOutboundResponseExcludedSetCookieHeaderDirectives();
   private Boolean removeUrlEncoding = false;
 
   private Set<String> convertCommaDelimitedHeadersToSet(String headers) {
     return headers == null ?  Collections.emptySet(): new 
HashSet<>(Arrays.asList(headers.split("\\s*,\\s*")));
   }
 
+  private Map<String, String> convertJSONHeadersToMap(String headers) {

Review comment:
       Analysed both the approaches which I posted above, first one looks like 
we are allowing a new special variable which does not come under param scope, 
that looked a little bad to me
   Second one however looks functionally more correct but will require many 
changes in param structure in  CustomDispatch class, which currently allows 
only name, value pairs inside it
   
   Not sure what should be done here




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 576051)
    Time Spent: 1h 40m  (was: 1.5h)

> Adding functionality to append headers in Configurable Dispatch
> ---------------------------------------------------------------
>
>                 Key: KNOX-2559
>                 URL: https://issues.apache.org/jira/browse/KNOX-2559
>             Project: Apache Knox
>          Issue Type: Improvement
>            Reporter: Mudit Sharma
>            Assignee: Mudit Sharma
>            Priority: Major
>         Attachments: 
> 0001-KNOX-2559-Added-functionality-to-append-headers-in-r.patch
>
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> Hi, We are using Apache Knox to guardrail our perimeter for our Hadoop 
> Cluster. As part of this we are abstracting out many APIs and putting them 
> behind Knox
> We had a requirement where we want to append some service specific headers in 
> the API calls before Knox submits it to the service. Livy had a similar 
> implementation but Livy created a whole new Dispatcher to do this
> We have different APIs and different set of headers for all of them. We are 
> suggesting to enlarge scope of current ConfigurableDispatcher to also allow 
> one more param:
>  
> <param>
>  <name>requestAppendHeaders</name>
>  <value>\{"a":"b"}</value>
>  </param>
>  
> If given above param, Knox while submitting the request to the service, will 
> add these headers along with the request



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