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Prior to this change, ServerOAuth2AuthorizedClientExchangeFilterFunction would invoke next.exchange: - first at assembly time inside the .switchIfEmpty call. - second at execution time inside .flatMap when a OAuth2AuthorizedClient is found. While this double-call should not technically cause any functional problems, since the Mono returned by the first call will not be subscribed if a OAuth2AuthorizedClient is found, it does result in a lot of unnecessary execution and object creation. There is no technical need to invoke the downstream filters twice. This change defers the call inside .switchIfEmpty, so that it will only execute at execution time if an OAuth2AuthorizedClient is not found. After this change, ServerOAuth2AuthorizedClientExchangeFilterFunction will not invoke next.exchange at assembly time, and will only execute next.exchange once per subscription at execution time. Fixes gh-6719
image::https://badges.gitter.im/Join%20Chat.svg[Gitter,link=https://gitter.im/spring-projects/spring-security?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge] image:https://travis-ci.org/spring-projects/spring-security.svg?branch=master["Build Status", link="https://travis-ci.org/spring-projects/spring-security"] = Spring Security Spring Security provides security services for the https://docs.spring.io[Spring IO Platform]. Spring Security 5.0 requires Spring 5.0 as a minimum and also requires Java 8. For a detailed list of features and access to the latest release, please visit https://spring.io/projects[Spring projects]. == Code of Conduct This project adheres to the Contributor Covenant link:CODE_OF_CONDUCT.adoc[code of conduct]. By participating, you are expected to uphold this code. Please report unacceptable behavior to spring-code-of-conduct@pivotal.io. == Downloading Artifacts See https://github.com/spring-projects/spring-framework/wiki/Downloading-Spring-artifacts[downloading Spring artifacts] for Maven repository information. == Documentation Be sure to read the https://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/[Spring Security Reference]. Extensive JavaDoc for the Spring Security code is also available in the https://docs.spring.io/spring-security/site/docs/current/api/[Spring Security API Documentation]. == Quick Start We recommend you visit https://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/[Spring Security Reference] and read the "Getting Started" page. == Building from Source Spring Security uses a https://gradle.org[Gradle]-based build system. In the instructions below, https://vimeo.com/34436402[`./gradlew`] is invoked from the root of the source tree and serves as a cross-platform, self-contained bootstrap mechanism for the build. === Prerequisites https://help.github.com/set-up-git-redirect[Git] and the https://www.oracle.com/technetwork/java/javase/downloads[JDK8 build]. Be sure that your `JAVA_HOME` environment variable points to the `jdk1.8.0` folder extracted from the JDK download. === Check out sources [indent=0] ---- git clone git@github.com:spring-projects/spring-security.git ---- === Install all spring-\* jars into your local Maven cache [indent=0] ---- ./gradlew install ---- === Compile and test; build all jars, distribution zips, and docs [indent=0] ---- ./gradlew build ---- Discover more commands with `./gradlew tasks`. See also the https://github.com/spring-projects/spring-framework/wiki/Gradle-build-and-release-FAQ[Gradle build and release FAQ]. == Getting Support Check out the https://stackoverflow.com/questions/tagged/spring-security[Spring Security tags on Stack Overflow]. https://spring.io/services[Commercial support] is available too. == Contributing https://help.github.com/articles/creating-a-pull-request[Pull requests] are welcome; see the https://github.com/spring-projects/spring-security/blob/master/CONTRIBUTING.md[contributor guidelines] for details. == License Spring Security is Open Source software released under the https://www.apache.org/licenses/LICENSE-2.0.html[Apache 2.0 license].