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niksis02
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Closes #2364 `AssumeRoleWithWebIdentity` only ever trusted an `OIDC` provider reachable over verified `https`, at a publicly routable address, on the implicit `:443`. That posture is right for an internet-facing IdP but rejects every address an internal one can have, so a `SPIFFE/SPIRE` OIDC discovery provider in the same cluster — or as a sidecar in the same pod — could never be registered, let alone verified against, and no setting could express "this private address is the IdP". Two opt-in flags on `versitygw iam`, both off by default: `--oidc-allow-private-endpoints` Permit a provider `Url` resolving to a loopback/private/link-local address, and an explicit port. Transport is unchanged: still `https`, still fully verified (a self-signed in-cluster cert is trusted the way AWS documents, through `ThumbprintList`). `--oidc-allow-insecure-transport` Additionally permit plaintext `http` provider URLs, discovery/JWKS endpoints and redirects, and drop TLS verification (`thumbprint` pinning included) for `https` ones. Both apply uniformly to the thumbprint auto-fetch at `CreateOpenIDConnectProvider` time and to the discovery-document plus `JWKS` fetch at `AssumeRoleWithWebIdentity` time. Neither weakens anything past the endpoint: signature verification, issuer matching, audience and trust policy evaluation are untouched, and the DNS-resolve-once/dial-the-resolved-IP shape stays in place so a rebind still cannot redirect a connection. An `http` provider keeps its scheme in its stored `Url`, `ARN` and `iss` matching, rather than being stripped like an `https` one — otherwise `"http://host"` and `"https://host"` would collapse onto a single ARN and storage key and each could satisfy the other's trust policy. It also stores an empty `ThumbprintList` rather than failing: a plaintext provider presents no certificate to thumbprint. Helm: `iamServer.oidc.{allowPrivateEndpoints,allowInsecureTransport}`, alongside `disableThumbprintAutofetch` moved into the same block (the flat `iamServer.disableOidcThumbprintAutofetch` stays honored). Chart `0.4.1 -> 0.4.2`. The WebUI's create-provider form no longer rejects `http` URLs and ports client-side; it cannot see the service's settings, so those two rules are left to the server, whose error surfaces as a toast like any other.