Fix validation, but not validating them?

docs/generation/gradle/validateSite.gradle

@@ -22,7 +22,8 @@ if (!repositories) {
 
 // links that are allowed to be http rather than https
 def httpLinks = [
-    "http://www.slf4j.org"
+    "http://www.slf4j.org",
+    "http://www.eckner.com/papers/Algorithms%20for%20Unevenly%20Spaced%20Time%20Series.pdf" // only available via http
 ]
 
 // links to exclude from validation (for example because they require authentication or use untrusted cert)
@@ -190,6 +191,7 @@ for (location in ["local", "remote"]) {
                   conn.connect()
                   def responseCode = conn.responseCode
                   if (responseCode != 200 &&
+                      responseCode != 302 && // common redirect status
                       responseCode != 403/* github auth */ &&
                       responseCode != 429 /* github rate limiting */) {
                     errors.add("$submittedHtmlFile: Unexpected HTTP status code `$responseCode` " +

servicetalk-loadbalancer/docs/modules/ROOT/pages/defaultloadbalancer.adoc

@@ -41,7 +41,7 @@ choices and the flexibility to add more if necessary.
 
 ==== Power of two Choices (P2C)
 
-Power of two choices (https://ieeexplore.ieee.org/document/963420[P2C]) is an algorithm that allows load balancers to
+Power of two choices (https://doi.org/10.1109/71.963420[P2C]) is an algorithm that allows load balancers to
 bias traffic toward hosts with a better 'score' while retaining the fairness of random selection. This algorithm is
 a random selection process but with a twist: it selects two hosts at random and from those two pick the 'best' where
 best is defined by a scoring system. ServiceTalk uses an Exponentially Weighted Moving Average