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Add a comment about a new use of the X-APOLLO-OPERATION-NAME header #2267

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May 5, 2022
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Add a comment about a new use of the X-APOLLO-OPERATION-NAME header #2267

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9 changes: 9 additions & 0 deletions Sources/Apollo/HTTPRequest.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,15 @@ open class HTTPRequest<Operation: GraphQLOperation> {
self.cachePolicy = cachePolicy

self.addHeader(name: "Content-Type", value: contentType)
// Note: in addition to this being a generally useful header to send, Apollo
// Server's CSRF prevention feature (introduced in AS3.7 and intended to be
// the default in AS4) includes this in the set of headers that indicate
// that a GET request couldn't have been a non-preflighted simple request
// and thus is safe to execute. If this project is changed to not always
// send this header, its GET requests may be blocked by Apollo Server with
// CSRF prevention enabled. See
// https://www.apollographql.com/docs/apollo-server/security/cors/#preventing-cross-site-request-forgery-csrf
// for details.
self.addHeader(name: "X-APOLLO-OPERATION-NAME", value: self.operation.operationName)
self.addHeader(name: "X-APOLLO-OPERATION-TYPE", value: String(describing: operation.operationType))
if let operationID = self.operation.operationIdentifier {
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