fix: [Many APIs] simplify logic for HTTP/1.1 REST fallback option (#4589

) * fix: simplify logic for HTTP/1.1 REST fallback option For the `fallback` parameter, all values considered as `true` in Boolean context will enable HTTP/1.1 REST fallback, since the other fallback transport, proto over HTTP, is removed from `google-gax` v4. PiperOrigin-RevId: 559812260 Source-Link: googleapis/googleapis@6a6fd29 Source-Link: googleapis/googleapis-gen@56c1665 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXZtd2FyZWVuZ2luZS8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXZwY2FjY2Vzcy8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXdlYnJpc2svLk93bEJvdC55YW1sIiwiaCI6IjU2YzE2NjU3ZTdhNTkxMjJiMWRhOTQ3NzFhOWVmNDA5ODljMjgyYzAifQ== Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXdlYnNlY3VyaXR5c2Nhbm5lci8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXdvcmtmbG93cy1leGVjdXRpb25zLy5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXdvcmtzdGF0aW9ucy8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNvbnRhaW5lci8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWRhdGFmbG93Ly5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWRldnRvb2xzLWFydGlmYWN0cmVnaXN0cnkvLk93bEJvdC55YW1sIiwiaCI6IjU2YzE2NjU3ZTdhNTkxMjJiMWRhOTQ3NzFhOWVmNDA5ODljMjgyYzAifQ== Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWRldnRvb2xzLWNsb3VkYnVpbGQvLk93bEJvdC55YW1sIiwiaCI6IjU2YzE2NjU3ZTdhNTkxMjJiMWRhOTQ3NzFhOWVmNDA5ODljMjgyYzAifQ== Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWRldnRvb2xzLWNvbnRhaW5lcmFuYWx5c2lzLy5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWlhbS1jcmVkZW50aWFscy8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWlhbS8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWlkZW50aXR5LWFjY2Vzc2NvbnRleHRtYW5hZ2VyLy5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLW1hcHMtYWRkcmVzc3ZhbGlkYXRpb24vLk93bEJvdC55YW1sIiwiaCI6IjU2YzE2NjU3ZTdhNTkxMjJiMWRhOTQ3NzFhOWVmNDA5ODljMjgyYzAifQ== Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLW1hcHMtbWFwc3BsYXRmb3JtZGF0YXNldHMvLk93bEJvdC55YW1sIiwiaCI6IjU2YzE2NjU3ZTdhNTkxMjJiMWRhOTQ3NzFhOWVmNDA5ODljMjgyYzAifQ== Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLW1hcHMtcGxhY2VzLy5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLW1hcHMtcm91dGluZy8uT3dsQm90LnlhbWwiLCJoIjoiNTZjMTY2NTdlN2E1OTEyMmIxZGE5NDc3MWE5ZWY0MDk4OWMyODJjMCJ9 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLW1vbml0b3JpbmctZGFzaGJvYXJkLy5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLXByaXZhY3ktZGxwLy5Pd2xCb3QueWFtbCIsImgiOiI1NmMxNjY1N2U3YTU5MTIyYjFkYTk0NzcxYTllZjQwOTg5YzI4MmMwIn0= * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md * 🦉 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>
googleapis · Aug 25, 2023 · 07967ad · 07967ad
1 parent 14fffdf
commit 07967ad
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diff --git a/packages/google-cloud-vmwareengine/samples/quickstart.js b/packages/google-cloud-vmwareengine/samples/quickstart.js
@@ -94,8 +94,9 @@ function main(parent) {
     };
 
     // Run request
-    const iterable =
-      await vmwareengineClient.listVmwareEngineNetworksAsync(request);
+    const iterable = await vmwareengineClient.listVmwareEngineNetworksAsync(
+      request
+    );
     for await (const response of iterable) {
       console.log(response);
     }

diff --git a/packages/google-cloud-vmwareengine/src/v1/vmware_engine_client.ts b/packages/google-cloud-vmwareengine/src/v1/vmware_engine_client.ts
@@ -99,16 +99,15 @@ export class VmwareEngineClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new VmwareEngineClient({fallback: 'rest'}, gax);
+   *     const client = new VmwareEngineClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -180,7 +179,7 @@ export class VmwareEngineClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -284,7 +283,7 @@ export class VmwareEngineClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {

diff --git a/packages/google-cloud-vmwareengine/test/gapic_vmware_engine_v1.ts b/packages/google-cloud-vmwareengine/test/gapic_vmware_engine_v1.ts
@@ -8221,8 +8221,9 @@ describe('v1.VmwareEngineClient', () => {
       ];
       client.innerApiCalls.listPrivateConnectionPeeringRoutes =
         stubSimpleCall(expectedResponse);
-      const [response] =
-        await client.listPrivateConnectionPeeringRoutes(request);
+      const [response] = await client.listPrivateConnectionPeeringRoutes(
+        request
+      );
       assert.deepStrictEqual(response, expectedResponse);
       const actualRequest = (
         client.innerApiCalls.listPrivateConnectionPeeringRoutes as SinonStub

diff --git a/packages/google-cloud-vpcaccess/src/v1/vpc_access_service_client.ts b/packages/google-cloud-vpcaccess/src/v1/vpc_access_service_client.ts
@@ -98,16 +98,15 @@ export class VpcAccessServiceClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new VpcAccessServiceClient({fallback: 'rest'}, gax);
+   *     const client = new VpcAccessServiceClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -177,7 +176,7 @@ export class VpcAccessServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -217,7 +216,7 @@ export class VpcAccessServiceClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {

diff --git a/packages/google-cloud-webrisk/src/v1/web_risk_service_client.ts b/packages/google-cloud-webrisk/src/v1/web_risk_service_client.ts
@@ -92,16 +92,15 @@ export class WebRiskServiceClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WebRiskServiceClient({fallback: 'rest'}, gax);
+   *     const client = new WebRiskServiceClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -167,7 +166,7 @@ export class WebRiskServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -193,7 +192,7 @@ export class WebRiskServiceClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {

diff --git a/packages/google-cloud-webrisk/src/v1beta1/web_risk_service_v1_beta1_client.ts b/packages/google-cloud-webrisk/src/v1beta1/web_risk_service_v1_beta1_client.ts
@@ -88,16 +88,15 @@ export class WebRiskServiceV1Beta1Client {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WebRiskServiceV1Beta1Client({fallback: 'rest'}, gax);
+   *     const client = new WebRiskServiceV1Beta1Client({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -164,7 +163,7 @@ export class WebRiskServiceV1Beta1Client {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {

diff --git a/packages/google-cloud-websecurityscanner/src/v1/web_security_scanner_client.ts b/packages/google-cloud-websecurityscanner/src/v1/web_security_scanner_client.ts
@@ -92,16 +92,15 @@ export class WebSecurityScannerClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WebSecurityScannerClient({fallback: 'rest'}, gax);
+   *     const client = new WebSecurityScannerClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -167,7 +166,7 @@ export class WebSecurityScannerClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {

diff --git a/packages/google-cloud-websecurityscanner/src/v1alpha/web_security_scanner_client.ts b/packages/google-cloud-websecurityscanner/src/v1alpha/web_security_scanner_client.ts
@@ -92,16 +92,15 @@ export class WebSecurityScannerClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WebSecurityScannerClient({fallback: 'rest'}, gax);
+   *     const client = new WebSecurityScannerClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -167,7 +166,7 @@ export class WebSecurityScannerClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {

diff --git a/packages/google-cloud-websecurityscanner/src/v1beta/web_security_scanner_client.ts b/packages/google-cloud-websecurityscanner/src/v1beta/web_security_scanner_client.ts
@@ -92,16 +92,15 @@ export class WebSecurityScannerClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WebSecurityScannerClient({fallback: 'rest'}, gax);
+   *     const client = new WebSecurityScannerClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -167,7 +166,7 @@ export class WebSecurityScannerClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {

diff --git a/packages/google-cloud-workflows-executions/src/v1/executions_client.ts b/packages/google-cloud-workflows-executions/src/v1/executions_client.ts
@@ -91,16 +91,15 @@ export class ExecutionsClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new ExecutionsClient({fallback: 'rest'}, gax);
+   *     const client = new ExecutionsClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -163,7 +162,7 @@ export class ExecutionsClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {

diff --git a/packages/google-cloud-workflows-executions/src/v1/workflows_client.ts b/packages/google-cloud-workflows-executions/src/v1/workflows_client.ts
@@ -98,16 +98,15 @@ export class WorkflowsClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WorkflowsClient({fallback: 'rest'}, gax);
+   *     const client = new WorkflowsClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -177,7 +176,7 @@ export class WorkflowsClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -220,7 +219,7 @@ export class WorkflowsClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {

diff --git a/packages/google-cloud-workflows-executions/src/v1beta/executions_client.ts b/packages/google-cloud-workflows-executions/src/v1beta/executions_client.ts
@@ -91,16 +91,15 @@ export class ExecutionsClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new ExecutionsClient({fallback: 'rest'}, gax);
+   *     const client = new ExecutionsClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -163,7 +162,7 @@ export class ExecutionsClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {

diff --git a/packages/google-cloud-workflows-executions/src/v1beta/workflows_client.ts b/packages/google-cloud-workflows-executions/src/v1beta/workflows_client.ts
@@ -95,16 +95,15 @@ export class WorkflowsClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
    *     need to avoid loading the default gRPC version and want to use the fallback
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new WorkflowsClient({fallback: 'rest'}, gax);
+   *     const client = new WorkflowsClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -170,7 +169,7 @@ export class WorkflowsClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -210,7 +209,7 @@ export class WorkflowsClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {