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If a server returns ERRCODE_CANNOT_CONNECT_NOW, try the next host, if multiple host names have been provided. This allows dealing gracefully with standby servers that might not be in hot standby mode yet. In the wake of the preceding commit, it might be plausible to retry many more error cases than we do now, but I (tgl) am hesitant to move too aggressively on that --- it's not clear it'd be desirable for cases such as bad-password, for example. But this case seems safe enough. Hubert Zhang, reviewed by Takayuki Tsunakawa Discussion: https://postgr.es/m/BN6PR05MB3492948E4FD76C156E747E8BC9160@BN6PR05MB3492.namprd05.prod.outlook.com