//D:\C\WcfService4\WcfService4\Web.config
<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.8" />
    <httpRuntime targetFramework="4.8" maxRequestLength="2147483647"/>
  </system.web>
  <system.serviceModel>
      <services>
          <service name="WcfService4.BookService">
              <endpoint address=""
                        binding="webHttpBinding"
                        bindingConfiguration="WebHttpBinding_IBookSerive"
                        behaviorConfiguration="webBehavior_test"
                        contract="WcfService4.IBookService"/>
              <host>
                  <baseAddresses>
                      <add baseAddress="http://localhost:8080"/>
                  </baseAddresses>
              </host>
          </service>
      </services>

      <bindings>
          <webHttpBinding>
              <binding name="WebHttpBinding_IBookSerive"
                       maxBufferPoolSize="2147483647"
                       maxReceivedMessageSize="2147483647">
                  <readerQuotas
                      maxDepth="2147483647"
                      maxStringContentLength="2147483647"
                      maxArrayLength="2147483647"
                      maxBytesPerRead="2147483647"
                      maxNameTableCharCount="2147483647"/>
              </binding>
          </webHttpBinding>
      </bindings>
      
    <behaviors>
        <endpointBehaviors>
            <behavior name="webBehavior_test">
                <webHttp/>
            </behavior>
        </endpointBehaviors>
        
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
      
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
</configuration>

//D:\C\WcfService4\WcfService4\IBookService.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace WcfService4
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IBookService" in both code and config file together.
    [ServiceContract]
    public interface IBookService
    {
        [OperationContract]
        [WebGet(UriTemplate="/GetBooksList?cnt={cnt}",RequestFormat =WebMessageFormat.Json, ResponseFormat =WebMessageFormat.Json)]
        List<Book> GetBooksList(int cnt);
    }


    [DataContract]
    public class Book
    {
        [DataMember(IsRequired = true,Order =1)]
        public long Id { get; set; }

        [DataMember(IsRequired = true, Order = 2)]
        public string Author { get; set; }

        [DataMember(IsRequired = true, Order = 3)]
        public string Abstract { get; set; }

        [DataMember(IsRequired = true, Order = 4)]
        public string Name { get; set; }

        [DataMember(IsRequired = true, Order = 5)]
        public string ISBN {  get; set; }

        [DataMember(IsRequired = true, Order = 6)]
        public string Title {  get; set; }

        [DataMember(IsRequired = true, Order = 7)]
        public string Topic {  get; set; }

        [DataMember(IsRequired =true, Order = 8)]
        public string Comment { get; set;  }

        [DataMember(IsRequired =true,Order = 9)]
        public string Content { get; set; }

        [DataMember(IsRequired =true,Order =10)]
        public string Summary {  get; set; }
    }
}


//D:\C\WcfService4\WcfService4\BookService.svc.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Threading;

namespace WcfService4
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "BookService" in code, svc and config file together.
    // NOTE: In order to launch WCF Test Client for testing this service, please select BookService.svc or BookService.svc.cs at the Solution Explorer and start debugging.
    public class BookService : IBookService
    {
        private static long idx = 0;
        private long GetIncrementIdx()
        {
            return Interlocked.Increment(ref idx);
        }

        public List<Book> GetBooksList(int cnt)
        {
            List<Book> bksList = new List<Book>();
            for (int i = 0; i < cnt; i++)
            {
                long a = GetIncrementIdx();
                bksList.Add(new Book()
                {
                    Id = a,
                    Name = $"Name_{a}",
                    ISBN = $"ISBN_{a}",
                    Comment = $"Comment_{a}",
                    Content = $"Content_{a}",
                    Summary = $"Summary_{a}",
                    Author = $"Author_{a}",
                    Abstract = $"Abstract_{a}",
                    Title = $"Title_{a}",
                    Topic = $"Topic_{a}"
                });
            }
            return bksList;
        }
    }
}

http://localhost:55548/BookService.svc/GetBooksList?cnt=100

//D:\C\WcfService4\WcfService4\Web.config
<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.8" />
    <httpRuntime targetFramework="4.8" maxRequestLength="2147483647"/>
  </system.web>
  <system.serviceModel>
      <services>
          <service name="WcfService4.BookService">
              <endpoint address=""
                        binding="webHttpBinding"
                        bindingConfiguration="WebHttpBinding_IBookSerive"
                        behaviorConfiguration="webBehavior_test"
                        contract="WcfService4.IBookService"/>
              <host>
                  <baseAddresses>
                      <add baseAddress="http://localhost:8080"/>
                  </baseAddresses>
              </host>
          </service>
      </services>

      <bindings>
          <webHttpBinding>
              <binding name="WebHttpBinding_IBookSerive"
                       maxBufferPoolSize="2147483647"
                       maxReceivedMessageSize="2147483647">
                  <readerQuotas
                      maxDepth="2147483647"
                      maxStringContentLength="2147483647"
                      maxArrayLength="2147483647"
                      maxBytesPerRead="2147483647"
                      maxNameTableCharCount="2147483647"/>
              </binding>
          </webHttpBinding>
      </bindings>
      
    <behaviors>
        <endpointBehaviors>
            <behavior name="webBehavior_test">
                <webHttp/>
            </behavior>
        </endpointBehaviors>
        
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
      
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>

    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true"/>
        <rewrite>
            <rules>
                <rule name="WCF Without SVC" stopProcessing="true">
                    <match url="^(.*)$"/>
                    <conditions logicalGrouping="MatchAll">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile"
                             negate="true"/>
                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true"/>
                    </conditions>
                    <action type="Rewrite" url="BookService.svc/{R:1}"/>
                </rule>
            </rules>
        </rewrite>
        <directoryBrowse enabled="true"/>
    </system.webServer>
</configuration>


//D:\C\WcfService4\WcfService4\IBookService.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace WcfService4
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IBookService" in both code and config file together.
    [ServiceContract]
    public interface IBookService
    {
        [OperationContract]
        [WebGet(UriTemplate="GetBooksList?cnt={cnt}",RequestFormat =WebMessageFormat.Json, ResponseFormat =WebMessageFormat.Json)]
        List<Book> GetBooksList(int cnt);
    }


    [DataContract]
    public class Book
    {
        [DataMember(IsRequired = true,Order =1)]
        public long Id { get; set; }

        [DataMember(IsRequired = true, Order = 2)]
        public string Author { get; set; }

        [DataMember(IsRequired = true, Order = 3)]
        public string Abstract { get; set; }

        [DataMember(IsRequired = true, Order = 4)]
        public string Name { get; set; }

        [DataMember(IsRequired = true, Order = 5)]
        public string ISBN {  get; set; }

        [DataMember(IsRequired = true, Order = 6)]
        public string Title {  get; set; }

        [DataMember(IsRequired = true, Order = 7)]
        public string Topic {  get; set; }

        [DataMember(IsRequired =true, Order = 8)]
        public string Comment { get; set;  }

        [DataMember(IsRequired =true,Order = 9)]
        public string Content { get; set; }

        [DataMember(IsRequired =true,Order =10)]
        public string Summary {  get; set; }
    }
}

//D:\C\WcfService4\WcfService4\BookService.svc.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Threading;

namespace WcfService4
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "BookService" in code, svc and config file together.
    // NOTE: In order to launch WCF Test Client for testing this service, please select BookService.svc or BookService.svc.cs at the Solution Explorer and start debugging.
    public class BookService : IBookService
    {
        private static long idx = 0;
        private long GetIncrementIdx()
        {
            return Interlocked.Increment(ref idx);
        }

        public List<Book> GetBooksList(int cnt)
        {
            List<Book> bksList = new List<Book>();
            for (int i = 0; i < cnt; i++)
            {
                long a = GetIncrementIdx();
                bksList.Add(new Book()
                {
                    Id = a,
                    Name = $"Name_{a}",
                    ISBN = $"ISBN_{a}",
                    Comment = $"Comment_{a}",
                    Content = $"Content_{a}",
                    Summary = $"Summary_{a}",
                    Author = $"Author_{a}",
                    Abstract = $"Abstract_{a}",
                    Title = $"Title_{a}",
                    Topic = $"Topic_{a}"
                });
            }
            return bksList;
        }
    }
}

http://localhost:55548/getbookslist?cnt=300000