CORS origins of an array of one are made a scalar. #1536
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The access-control-allowed-origins CORS header only allows a single origin or "*" as its response. To support multiple origins, the cors middleware makes this header dynamic based on the origin header of the request when the middleware is configured with anything but a single string. To help avoid a few edge cases customers may encounter, we can unwrap an array of one element into a scalar to encourage the cors middleware to make the access-control-allowed-origin header static. As a very minor performance boost, this change also instantiates the cors middleware once and uses it on all requests rather than constructing it dynamically within a request.
colerogers
approved these changes
Mar 15, 2024
BenaymS
reviewed
Mar 25, 2024
| // on the origin header of the request. If there is only one element in the | ||
| // array, this is unnecessary. | ||
| if (Array.isArray(origin) && origin.length === 1) { | ||
| origin = origin[1]; |
There was a problem hiding this comment.
Is this a bug... shouldn't this either be origin = origin[0] or origin = undefined?
inlined
added a commit
that referenced
this pull request
Mar 26, 2024
inlined
added a commit
that referenced
this pull request
Mar 27, 2024
This was referenced May 24, 2024
This was referenced Sep 6, 2024
# for free
to join this conversation on GitHub.
Already have an account?
# to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The access-control-allowed-origins CORS header only allows a single origin or "*" as its response. To support multiple origins, the cors middleware makes this header dynamic based on the referrer header of the request when the middleware is configured with anything but a single string.
To help avoid a few edge cases customers may encounter, we can unwrap an array of one element into a scalar to encourage the cors middleware to make the access-control-allowed-origin header static.
As a very minor performance boost, this change also instantiates the cors middleware once and uses it on all requests rather than constructing it dynamically within a request.