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Discover how to fix the `unsupported compression method` error in .NET Core 3.1 SOAP requests. Follow our step-by-step guide to optimize your buffer settings and improve your service interactions.
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Resolving the Error Flushing XmlSerializer Buffer in .NET Core SOAP Requests

If you've ever encountered the error message "The archive entry was compressed using an unsupported compression method" while working on a SOAP request in .NET Core, you know how frustrating it can be. This issue typically arises when the buffer settings for your service binding are not configured correctly, hindering the serialization process for your SOAP messages.

In this guide, we will delve into the root cause of this error and guide you through step-by-step instructions to solve it, ensuring that your SOAP requests run smoothly.

Understanding the Problem

When you attempt to send a request to a peer-to-peer payments platform using the auto-generated SOAP client in .NET Core 3.1, the following exception may occur:

[[See Video to Reveal this Text or Code Snippet]]

Most of the time, this issue stems from the configurations of the buffer sizes and message sizes in your binding setup, particularly in your WCF (Windows Communication Foundation) service requests. When the buffer sizes exceed a certain limit, the serializer may fail to flush the data properly and throw the aforementioned exception.

Encountering the Exception

Here’s the context for the error you're facing:

You have an auto-generated model (EbMtvnSvcReq) intending to serialize SOAP requests.

During the serialization process, the buffering fails while creating the message stream, causing it to throw the exception described above.

The Solution: Adjusting Buffer Settings

The good news is that you can solve this issue by adjusting the buffer settings within your service binding configuration. Below is a step-by-step breakdown of how to do this:

Step 1: Create a Binding Configuration

Modify the GetBindingForEndpoint method in your service client code. You will need to set lower limits for various buffer-related parameters. Here’s the adjusted code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Key Configuration Parameters Explained

MaxBufferSize: This defines the size limit for the buffer that stores the serialized message. Setting a value lower than int.MaxValue prevents memory overflows and issues related to large data sizes.

MaxReceivedMessageSize: Adjusting this value ensures that the server can handle the incoming message size without throwing an error.

MaxBufferPoolSize: This affects the pool of available memory used for buffers. Depending on your application needs, you can fine-tune this value as well.

ReaderQuotas: By setting this to XmlDictionaryReaderQuotas.Max, you allow maximum flexibility over the types of XML messages processed by your application.

Step 3: Testing the Changes

Once you have applied these adjustments, test your SOAP requests again to confirm that the error no longer occurs. You should find that your application can now serialize and send messages without encountering the previous buffer issues.

Conclusion

In summary, encountering the "unsupported compression method" error while sending SOAP requests in .NET Core can be frustrating. However, by carefully adjusting the buffer settings in your service bindings, you can effectively resolve these issues and enhance the robustness of your application.

Implement the steps outlined above, and don't let serialization errors hold you back from creating seamless communication between services. If you have any further questions or need assistance, feel free to reach out!