fix: use fresh context object per request (#60)

refs storacha/gateway-lib#36
refs
filecoin-project/lassie#340 (comment)

Author: Alan Shaw

package-lock.json

@@ -27,7 +27,7 @@
     "@ipld/dag-cbor": "^9.0.0",
     "@ipld/dag-json": "^10.0.1",
     "@ipld/dag-pb": "^4.0.2",
-    "@web3-storage/gateway-lib": "^3.2.2",
+    "@web3-storage/gateway-lib": "^3.2.4",
     "cardex": "^2.2.2",
     "chardet": "^1.5.0",
     "dagula": "^7.0.0",

package.json

@@ -1,5 +1,6 @@
 /* eslint-env worker */
 import {
+  withContext,
   withCorsHeaders,
   withContentDispositionHeader,
   withErrorHandler,
@@ -33,6 +34,7 @@ export default {
     console.log(request.method, request.url)
     const middleware = composeMiddleware(
       withCdnCache,
+      withContext,
       withCorsHeaders,
       withVersionHeader,
       withContentDispositionHeader,