in src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFile.java [212:219]
public InputStream content() throws IOException, InterruptedException {
String blobUrl = ASFGitSCMFileSystem.buildTemplateWithRemote("{+server}{?p}{;a,f,hb}", remote)
.set("a", "blob_plain")
.set("hb", refOrHash)
.set("f", getPath())
.expand();
return new URL(blobUrl).openStream();
}