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fix(ai-gateway): strip cf-* headers and skip body on GET in OpenAI proxy #7

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Merged
simple10 merged 1 commit into from
Mar 12, 2026
Merged

fix(ai-gateway): strip cf-* headers and skip body on GET in OpenAI proxy #7

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14 changes: 8 additions & 6 deletions workers/ai-gateway/src/providers/openai.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,11 @@ export async function proxyOpenAI(
// Replace auth token with OpenAI API key
headers.set('Authorization', `Bearer ${apiKey}`)

// Strip Cloudflare-injected metadata headers that shouldn't reach upstream providers
for (const key of [...headers.keys()]) {
if (key.startsWith('cf-')) headers.delete(key)
}

// Set provider-config headers (e.g. cf-aig-authorization for gateway mode,
// X-Proxy-Auth for egress proxy)
if (config.headers) {
Expand All @@ -26,16 +31,13 @@ export async function proxyOpenAI(
}

// When egress proxy is configured, wrap the target URL in the proxy URL
// and strip CF-injected headers that shouldn't reach the upstream
// and strip additional proxy-revealing headers
const url = config.egressProxyUrl
? `${config.egressProxyUrl}?_proxyUpstreamURL_=${encodeURIComponent(targetUrl)}`
: targetUrl

if (config.egressProxyUrl) {
for (const h of [
'host', 'cf-connecting-ip', 'cf-ipcountry', 'cf-ray', 'cf-visitor',
'x-real-ip', 'x-forwarded-proto', 'x-forwarded-for',
]) {
for (const h of ['host', 'x-real-ip', 'x-forwarded-proto', 'x-forwarded-for']) {
headers.delete(h)
}
}
Expand All @@ -48,6 +50,6 @@ export async function proxyOpenAI(
return fetch(url, {
method: request.method,
headers,
body,
body: request.method !== 'GET' ? body : undefined,
})
}