Change SpamVerdictService GET to POST

- Add error logging if any HTTP errors occur

app/services/spam/spam_verdict_service.rb

@@ -41,10 +41,10 @@ module Spam
       return unless Gitlab::CurrentSettings.spam_check_endpoint_enabled
       return if endpoint_url.blank?
 
-      result = Gitlab::HTTP.try_get(endpoint_url, verdict_params)
+      begin
+        result = Gitlab::HTTP.post(endpoint_url, body: verdict_params.to_json, headers: { 'Content-Type' => 'application/json' })
         return unless result
 
-      begin
         json_result = Gitlab::Json.parse(result).with_indifferent_access
         # @TODO metrics/logging
         # Expecting:
@@ -56,6 +56,10 @@ module Spam
         # @TODO log if json_result[:error]
 
         json_result[:verdict]
+      rescue *Gitlab::HTTP::HTTP_ERRORS => e
+        # @TODO: log error via try_post https://gitlab.com/gitlab-org/gitlab/-/issues/219223
+        Gitlab::ErrorTracking.log_exception(e)
+        return
       rescue
         # @TODO log
         ALLOW

spec/services/spam/spam_verdict_service_spec.rb

@@ -169,7 +169,7 @@ describe Spam::SpamVerdictService do
       before do
         stub_application_setting(spam_check_endpoint_enabled: true)
         stub_application_setting(spam_check_endpoint_url: "http://www.spamcheckurl.com/spam_check")
-        stub_request(:any, /.*spamcheckurl.com.*/).to_return( body: spam_check_body.to_json, status: spam_check_http_status )
+        stub_request(:post, /.*spamcheckurl.com.*/).to_return( body: spam_check_body.to_json, status: spam_check_http_status )
       end
 
       context 'if the endpoint is accessible' do
@@ -248,7 +248,7 @@ describe Spam::SpamVerdictService do
 
       context 'if the endpoint times out' do
         before do
-          stub_request(:any, /.*spamcheckurl.com.*/).to_timeout
+          stub_request(:post, /.*spamcheckurl.com.*/).to_timeout
         end
 
         it 'returns nil' do