Make Unlimited Concurrent Callouts to Internal Salesforce URLs

You can now make unlimited concurrent callouts to endpoints in your Salesforce org’s domain. You no longer need to live in fear of hitting limits when you set up cross-org integrations to synchronize data between your orgs. You can also make unlimited callouts back into your own org to access the Metadata API, use describeLayout(), and so on.

Previously, you could make only 20 simultaneous requests to URLs within one host, including to URLs within your org’s domain. That limit has been lifted for internal URLs. However, you can still make only 100 total callouts in a transaction, including to internal URLs. PageReference.getContent() callouts to Visualforce pages are exempt from the per-transaction limit.