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Venkatesh Velu (VenkatVelu)
Standard Chartered Bank
Pega Development Solution Architect
Standard Chartered Bank
VenkatVelu Member since 2011 6 posts
Standard Chartered Bank
Posted: July 28, 2016
Last activity: July 29, 2016

Unauthorized access: If-Match does not match ETag


For most of beginners who are trying to use PUT API call, they will get stuck what value they have to put in If-Match attribute. Below information will help them to overcome that issue.


What is the value you have to give in If-Match field of PUT /cases/{ID} API call?

Value of the entity tag that is received as ETag header in responses to create case and get case details APIs

When you want to update a case using PUT API call, you have to give an etag value in If-Match request attribute. You can get the etag from Create Case or Get Case Reponse Header. I have highlighted in bold in the below response header.


Response Header of Get Case ID:

  "date": "Thu, 28 Jul 2016 04:00:01 GMT",
  "content-encoding": "gzip",
  "server": "Apache-Coyote/1.1",
  "x-powered-by": "Servlet 2.5; JBoss-5.0/JBossWeb-2.1",
  "etag": "\"20160728T024035.456 GMT\"",
  "warning": "299 uklvadcsc01a.uk.standardchartered.com \"Use of TLS/SSL is strongly recommended for services using Basic Authentication\"",
  "content-type": "application/json;charset=UTF-8",
  "cache-control": "no-cache, proxy-revalidate",
  "proxy-connection": "Keep-Alive",
  "connection": "Keep-Alive",
  "content-length": "2348"}


If you give wrong value you will get the below error.


  "pxObjClass": "Pega-API-CaseManagement-Case",

  "errors": [


      "ID": "Pega_API_021",

      "message": "Unauthorized access: If-Match does not match ETag",

      "pxObjClass": "Pega-API-Error"






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