[jira] [Created] (OLINGO-1382) Add ETag Headers based on content in batch requests

["Manuel Blechschmidt (JIRA)" <ji...@apache.org>]

Manuel Blechschmidt created OLINGO-1382:
-------------------------------------------

             Summary: Add ETag Headers based on content in batch requests
                 Key: OLINGO-1382
                 URL: https://issues.apache.org/jira/browse/OLINGO-1382
             Project: Olingo
          Issue Type: New Feature
          Components: odata2-core
    Affects Versions: V2 2.0.11
            Reporter: Manuel Blechschmidt


Onlingo should add ETag headers to batch responses.

Load something in a batch where the server adds ETag Headers and the client adds If-None-Match headers
{code}
--batch_d34e-a126-e108
Content-Type: application/http
Content-Transfer-Encoding: binary

GET Todos/$count?sap-context-token=1 HTTP/1.1
sap-cancel-on-close: true
sap-contextid-accept: header
Accept: text/plain, */*;q=0.5
Accept-Language: en
DataServiceVersion: 2.0
MaxDataServiceVersion: 2.0
If-None-Match: a9b7ba70783b617e9998dc4dd82eb3c5


--batch_d34e-a126-e108
Content-Type: application/http
Content-Transfer-Encoding: binary

GET Todos?sap-context-token=1&$skip=0&$top=20 HTTP/1.1
sap-cancel-on-close: true
sap-contextid-accept: header
Accept: application/json
Accept-Language: en
DataServiceVersion: 2.0
MaxDataServiceVersion: 2.0
If-None-Match: ae7753e6e1221dc638923e62a9396ce4


--batch_d34e-a126-e108--
{code}

Expected response:
{code}
--batch_a120f6c4-7062-4c4e-a560-cc1c980099cb
Content-Type: application/http
Content-Transfer-Encoding: binary

HTTP/1.1 304 Not Modified
Content-Length: 0


--batch_a120f6c4-7062-4c4e-a560-cc1c980099cb
Content-Type: application/http
Content-Transfer-Encoding: binary

HTTP/1.1 304 Not Modified
Content-Length: 0


--batch_a120f6c4-7062-4c4e-a560-cc1c980099cb--
{code}

This is implemented here:
https://github.com/ManuelB/blueprint/blob/master/src/main/java/de/incentergy/architecture/odata/ETagODataJPAProcessor.java

On the client side a request to add this is here:
https://github.com/SAP/openui5/issues/2624



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