@Jagadeesh_Prakash  I haven't done this myself but found this article where there is python script to do this. Check this link out which might be helpful to you.https://experienceleague.adobe.com/en/docs/experience-cloud-kcs/kbarticles/ka-16448 

@Kous1992 Do you have a specific use case you are looking into? You can check this blog post from Dan about concurrency pitfalls(this is an old blog post but I think it is still relevant) https://blogs.perficient.com/2017/12/05/2-common-concurrency-pitfalls-in-aem-and-how-to-avoid-them/

@Rama_KrishnaNy  Here is an earlier post with almost the same issue as yours. Check it once to solve your solve.https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/cannot-serve-request-to-content-html-in-org-apache-sling/td-p/574695 If the above didn't solve, try following the ...

@Divya_13 What is your end goal of integration with Marketo?If it for pushing leads to Marketo for a particular program/campaign, then you can try using Marketo API.  This link directs you the submit form API  /rest/v1/leads/submitForm.json Using the API, you can control the form like adding recapth...

@Shubham_borole Haven't seen this issue.Commenting to follow to see the response form Adobe.

@Samikshash If you are directly hitting the publish url, CDN doesn't come into picture. In this case, are you hitting the publish instance directly ? You should follow what @arunpatidar explained about caching these header to see them. 

@Nick_Hilton I used different url and able to register now.

Sure @Nick_Hilton . Thank you for the direct link. Appreciate it.Looks like Splash is used for building the event page. Splash has sometime this problem where people are not able to register to the event which will resolve on its own after sometime. We faced it sometime when we hosted. 

@Nick_Hilton I'm from NAM. The page opens from me now but not able to register. I tried disabling my firewall as well.  It is showing 400 Bad Request in the developer console But I don't want to waste too much time of yours as well if this is too much to fix. I can understand.

@Samikshash I guess you might have tried restarted dispatcher already. If not, try restarting dispatcher. This will help making changes take effect. Are using a CDN in front of the Dispatcher. If you are, make sure to whitelist the "Link" header at the CDN level to allow it to pass through to the Di...