{"version":"2.1.248","anchor":"internal-beta-headers-for-mid-conversation-cache-promotion","canonical_anchor":"internal-beta-headers-for-mid-conversation-cache-promotion","heading":"Internal beta headers for mid-conversation cache promotion","tier":"internal","area":"Prompt Caching","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.248\/e\/internal-beta-headers-for-mid-conversation-cache-promotion","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.248","markdown":"### Internal beta headers for mid-conversation cache promotion\n\nTwo internal beta features cover promoting a prompt cache mid-conversation.\n\n**What**\n\nTwo internal beta features register alongside the existing ones such as interleaved thinking and server-side fallback, both concerning promoting a prompt cache partway through a conversation. They use internal headers rather than dated public betas.\n\n**Details**\n\n- The registration helper only freezes a name and header pair; what decides whether the header is actually sent lives elsewhere in the request path.\n\n**Evidence**\n\n`x-cc-internal-mid-conv-cache-promotion`\n\n- Area: Prompt Caching\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 3\/5"}