Rescue ErrorDuringExecution instead of changing curl_headers return type.

Library/Homebrew/livecheck/strategy.rb

@@ -182,6 +182,7 @@ module Homebrew
         headers = []
 
         [:default, :browser].each do |user_agent|
+          begin
             parsed_output = curl_headers(
               url,
               wanted_headers:    ["location", "content-disposition"],
@@ -189,7 +190,9 @@ module Homebrew
               user_agent:        user_agent,
               **DEFAULT_CURL_OPTIONS,
             )
-          next if parsed_output.blank?
+          rescue ErrorDuringExecution
+            next
+          end
 
           parsed_output[:responses].each { |response| headers << response[:headers] }
           break if headers.present?

Library/Homebrew/utils/curl.rb

@@ -213,8 +213,7 @@ module Utils
         )
 
         # 22 means a non-successful HTTP status code, not a `curl` error, so we still got some headers.
-        next if !result.success? && result.exit_status != 22
-
+        if result.success? || result.exit_status == 22
           parsed_output = parse_curl_output(result.stdout)
 
           # If we didn't get any wanted header yet, retry using `GET`.
@@ -224,7 +223,8 @@ module Utils
           return parsed_output if result.success?
         end
 
-      nil
+        result.assert_success!
+      end
     end
 
     # Check if a URL is protected by CloudFlare (e.g. badlion.net and jaxx.io).