fix: custom host for resumable uploads (#2696)

* fix: custom host  for resumable uploads

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

README.md

@@ -60,13 +60,13 @@ implementation 'com.google.cloud:google-cloud-bigquery'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-bigquery:2.25.0'
+implementation 'com.google.cloud:google-cloud-bigquery:2.26.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquery" % "2.25.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquery" % "2.26.0"
 ```
 <!-- {x-version-update-end} -->
 
@@ -348,7 +348,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-bigquery/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-bigquery.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-bigquery/2.25.0
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-bigquery/2.26.0
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles

google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/spi/v2/HttpBigQueryRpc.java

@@ -77,8 +77,7 @@
 public class HttpBigQueryRpc implements BigQueryRpc {
 
   public static final String DEFAULT_PROJECTION = "full";
-  private static final String BASE_RESUMABLE_URI =
-      "https://www.googleapis.com/upload/bigquery/v2/projects/";
+  private static final String BASE_RESUMABLE_URI = "upload/bigquery/v2/projects/";
   // see:
   // https://cloud.google.com/bigquery/loading-data-post-request#resume-upload
   private static final int HTTP_RESUME_INCOMPLETE = 308;
@@ -725,7 +724,11 @@ public QueryResponse queryRpc(String projectId, QueryRequest content) {
   @Override
   public String open(Job loadJob) {
     try {
-      String builder = BASE_RESUMABLE_URI + options.getProjectId() + "/jobs";
+      String builder = options.getHost();
+      if (!builder.endsWith("/")) {
+        builder += "/";
+      }
+      builder += BASE_RESUMABLE_URI + options.getProjectId() + "/jobs";
       GenericUrl url = new GenericUrl(builder);
       url.set("uploadType", "resumable");
       JsonFactory jsonFactory = bigquery.getJsonFactory();