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Ok in my case the problem is SpringSecurity , so it's setting X-Frame-Options header to DENY by default.
If I change this default value to SAMEORIGIN I can get the form response. In Spring Security xml config file:
<frame-options policy="SAMEORIGIN" />
In ExtJs5.x also i am facing same issue... Can any one give me the solution ?
same problem for ext 6. any workaround
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I faced this issue in 6.2.0
I was able to to use this workaround successfully (Wilk's answer):