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Once header ETAG is refreshed, the function bindS3Header is called as callback:
Everytime bindS3Header is called, the logo will be retrieved from backend:
refresh the model, so that the latest logo could be displayed in Fiori correctly:
一直到3767执行完，network里都观察不到对$value的引用。
通过Chrome network观察到虽然在column下面只能看到$value, 但是鼠标放上去后通过tooltip仍然可以看到完整的url。
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