<s>[INST] I'm thinking about using OSVDB.org (Open Source Vulnerability Database), however I ran into a boundary issue with cross-site request forgery prevention. Unfortunately their hosting environment does not provide the required headers to indicate the 'origins', but we still want to make secure requests to this service.

Challenge description:

Proves and justifies a secure communication with OSVDB.org considering the missing HTTP Header 'Origin'. Leading to not having the 'Access-Control-Allow-Origin' mechanism in our application. Understanding the problem and emphasizing 'Security over Convenience'. Without turning off completely the security feature of CORS, we are given the open task of tackling the issues through implementation or code tweaks, solutions may include subtle changes in the approach, nuanced shifts in trade-off considerations and "proof-of-concepts".

**Task:**
Prove and justify a secure communication with OSVDB.org despite the absence of the 'Origin' HTTP Header.

**Technical Environment:**

* Client: Web Application
* Server: Web Service/OSVDB API

**Security Goal:**

Securely utilize the OSVDB API without disabling CORS functionality, taking into consideration the 'Security over Convenience' paradigm.

Any ideas?[/INST]