utility functions. Allowing them to be optional. Also allowing to have multiple alternative security schemes that are then checked in a single dependency instead of each one verifying and returning the error to the client automatically when not satisfied. PR [#134](https://github.com/tiangolo/fastapi/pull/134).

* Update [SQL Tutorial](https://fastapi.tiangolo.com/tutorial/sql-databases/#create-a-middleware-to-handle-sessions) to close database sessions even when there are exceptions....

// defined in RFC 7627 and allowed by SP 800-135, Revision 1, Section 4.2.2. func MasterSecret[H fips140.Hash](hash func() H, preMasterSecret, transcript []byte) []byte { // "The TLS 1.2 KDF is an approved KDF when the following conditions are // satisfied: [...] (3) P_HASH uses either SHA-256, SHA-384 or SHA-512." h := hash() switch any(h).(type) { case *sha256.Digest: if h.Size() != 32 { fips140.RecordNonApproved() } case *sha512.Digest: if h.Size() != 46 && h.Size() != 64 { fips140.RecordNonApproved()...

as // defined in RFC 7627 and allowed by SP 800-135, Revision 1, Section 4.2.2. func MasterSecret[H hash.Hash](hash func() H, preMasterSecret, transcript []byte) []byte { // "The TLS 1.2 KDF is an approved KDF when the following conditions are // satisfied: [...] (3) P_HASH uses either SHA-256, SHA-384 or SHA-512." h := hash() switch any(h).(type) { case *sha256.Digest: if h.Size() != 32 { fips140.RecordNonApproved() } case *sha512.Digest: if h.Size() != 46 && h.Size() != 64 { fips140.RecordNonApproved()...