How to specify multiple path patterns for a CloudFront Behavior?

Question

I have a CloudFront distribution with an s3 origin and a custom origin. I would like all traffic on /api/* and /admin/* to go to the custom origin, and all other traffic to go to the s3 origin. Currently I have it working with only /api/*:

                cloudfront.SourceConfiguration(
                    custom_origin_source=cloudfront.CustomOriginConfig(
                        domain_name=alb,
                        origin_protocol_policy=cloudfront.OriginProtocolPolicy.MATCH_VIEWER,
                    ),
                    behaviors=[
                        cloudfront.Behavior(
                            allowed_methods=cloudfront.CloudFrontAllowedMethods.ALL,
                            path_pattern="/api/*",
                            forwarded_values={
                                "headers": ["*"],
                                "cookies": {"forward": "all"},
                                "query_string": True,
                            },
                        )
                    ],
                ),

I could probably repeat the behavior with /api/*, but I will eventually have some additional paths to add that will need to be routed to the custom origin (ALB), so I'm wondering if there is a way to do this that is more DRY.

Does path_pattern accept /{api,admin,other}/* style patterns? Or should I refactor the Behaviors section to reuse allowed_methods and forwarded_values and then repeat multiple behaviors with a different path_pattern?

jellycsc · Accepted Answer · 2020-05-09 23:51:57Z

6

Does path_pattern accept /{api,admin,other}/* style patterns?

No, this pattern style is not supported based on the documentation.

should I refactor?

Yes, you can simply save all the path_pattern corresponding to this custom origin into a list, say path_patterns. Then use a simple handy Python list comprehension,

behaviors=[
    cloudfront.Behavior(
        allowed_methods=cloudfront.CloudFrontAllowedMethods.ALL,
        path_pattern=pp,
        forwarded_values={
            "headers": ["*"],
            "cookies": {"forward": "all"},
            "query_string": True,
        },
    ) for pp in path_patterns
]

answered May 9, 2020 at 23:51

jellycsc

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1 Comment

Michael - sqlbot Over a year ago

Note also that the default limit to the number of cache behaviors (and therefore path patterns) per distribution is 25 but AWS Support can bump this up on request, to a value as high as 250 if needed.

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