The remote server returns an unexpected 400 Bad Request.

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The remote server returns an unexpected 400 Bad Request. The reason is: the amount of data transmitted is too large.
Solution:
First, in the client configuration file:
1. Modify the maximum data transfer quota on the node <binding>:

1. <System. serviceModel>
2. <Bindings>
3. <BasicHttpBinding>
4. <Binding name = "BasicHttpBinding_USService1" closeTimeout = "00:03:00"
5. OpenTimeout = "00:03:00" receiveTimeout = "00:10:00" sendTimeout = "00:03:00"
6. AllowCookies = "false" bypassProxyOnLocal = "false" hostNameComparisonMode = "StrongWildcard"
7. MaxBufferSize = "2147483647" maxBufferPoolSize = "2147483647" maxcompute edmessagesize = "2147483647"
8. MessageEncoding = "Text" textEncoding = "UTF-8" transferMode = "Buffered"
9. UseDefaultWebProxy = "true">
10. <ReaderQuotas maxDepth = "32" maxStringContentLength = "2147483647"
11. MaxArrayLength = "2147483647" maxBytesPerRead = "2147483647" maxNameTableCharCount = "2147483647"/>
12. <Security mode = "None">
13. <Transport clientCredentialType = "None" proxyCredentialType = "None"
14. Realm = ""/>
15. <Message clientCredentialType = "UserName" algorithmSuite = "Default"/>
16. </Security>
17. </Binding>
18. </BasicHttpBinding>
19. </Bindings>
20. <Client>
21. <Endpoint address = "http: // localhost: 8001/usinfoservices" binding = "basicHttpBinding"
22. BindingConfiguration = "BasicHttpBinding_USService1" contract = "ServiceReference2.USService"
23. Name = "BasicHttpBinding_USService1"/>
24. </Client>
25. </System. serviceModel>
26. Then, modify the <Hosting> configuration file on the server:
27. 1. Modify the maximum data transfer quota on the node <binding>:
28. <System. serviceModel>
29. <Bindings>
30. <BasicHttpBinding>
31. <Binding name = "newBinding" maxBufferPoolSize = "21474835647" maxcompute edmessagesize = "2147483647" messageEncoding = "Text">
32. <ReaderQuotas maxDepth = "2147483647" maxStringContentLength = "2147483647" maxArrayLength = "2147483647" maxBytesPerRead = "2147483647" maxNameTableCharCount = "2147483647"/>
33. </Binding>
34. </BasicHttpBinding>
35. </Bindings>
36. <Behaviors>
37. <ServiceBehaviors>
38. <Behavior name = "metadataBehavior">
39. <ServiceMetadata httpGetEnabled = "true"/>
40. <ServiceDebug includeExceptionDetailInFaults = "true"/>
41. </Behavior>
42. </ServiceBehaviors>
43. </Behaviors>
44. <Services>
45. <Service behaviorConfiguration = "metadataBehavior" name = "Genesysinfo. USServices. Services. USInfoServices">
46. <Endpoint address = "" bindingConfiguration = "newBinding" binding = "basicHttpBinding" contract = "Genesysinfo. USServices. Contracts. IUSInfoServices"/>
47. <Endpoint address = "" binding = "netTcpBinding" contract = "Genesysinfo. USServices. Contracts. IUSInfoServices"/>
48. <Host>
49. <BaseAddresses>
50. <Add baseAddress = "http: // localhost: 8001/usinfoservices"/>
51. <Add baseAddress = "net. tcp: // localhost: 8000/usinfoservices"/>
52. </BaseAddresses>
53. </Host>
54. <Endpoint address = "mex" binding = "mexTcpBinding" contract = "IMetadataExchange"/>
55. </Service>
56. </Services>
57. </System. serviceModel>

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OK.