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HTTP Status Code 417-EXPECTATION FAILED

by Saurabh Chalise

  • 4 min read
    • HTTP Status
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HTTP Status Code 417-EXPECTATION FAILED image

Navigation

  • Introduction
  • General Understanding
  • Status
  • Possible Cause
  • Possible Solutions
  • Specifications
  • Related Articles
  • FAQ
    • What does HTTP Status Code 417 mean?
    • What are the causes of HTTP Status Code Error 417?
  • 417 CODE REFERENCES
  • Conclusion

Introduction

HTTP Status Code 417-Expectation Failed is one of the classes of 4xx(Server Error) response code that indicates the request’s Expect header expectation could not be fulfilled.

General Understanding

When a server encounters an Expect header it doesn’t understand or support, it returns 417 Expectation Failed.

The Expect header can be used by a client to inform the server that it expects a certain response from the server.

The only uniform expectation (as far as I’m aware) is 100-continue.

This is how it appears:

POST /foo/bar HTTP/1.1
Content-Type: application/gzip
Content-Length: 12345678765
Expect: 100-continue
…

This request is for a huge file to be uploaded. The client informs the server that it wants a 100 Continue answer from the server first.

If a server supports this, it will initially respond with a 100 Continue answer, indicating that the request was understood, accepted, and most likely acceptable and that the client can proceed with the upload.

If the server does not support this functionality, it must respond with an error code of 417:

HTTP/1.1 417 Expectation Failed

Content-Type: text/plain
We don’t support 100-continue

A server should always return 417 if it encounters a different sort of expectation, such as a new future standard or a custom extension.

Status

417 Expectation Failed

Possible Cause

One probable cause is that your server is expecting data in a specific format or encoding, which you did not supply. In rare cases, certain servers will reject the expect-continue flag if it is set to ON.

Possible Solutions

You can attempt one of two different workarounds.

If you’re using an XML Data type in your SQL Query and delivering the result to a remote server via a Web API Destination or SSIS REST API Task.

  1. Change your source SQL query to output nvarchar datatype instead of XML datatype for your XML data.

select CAST(myXmlColumn as nvarchar(max)) as myXmlColumn from myTable

2. If you’re not utilizing the XML data format and are still getting the 417 Expectation Failed problem, consider adding a Script Task before using any API (add the first step in your flow).

Edit the Microsoft SSIS Script Task by dragging it.

Add the following one line to the script’s Main method, shut it, and try running your package again to see if it helps.

System.Net.ServicePointManager.Expect100Continue = false;

Specifications

SpecificationTitle
RFC 7231, section 6.5.14: 417 Expectation FailedHypertext Transfer Protocol (HTTP/1.1): Semantics and Content

Related Articles

HTTP Status Code 207 Multi-Status
HTTP Status Code 300-Multiple Choices
HTTP Status Code 302 Found
HTTP Status Code 204 – No Content

FAQ

What does HTTP Status Code 417 mean?

HTTP Status Code 417-Expectation Failed is one of the classes of 4xx(Server Error) response code that indicates the request’s Expect header expectation could not be fulfilled.

What are the causes of HTTP Status Code Error 417?

One probable cause is that your server is expecting data in a specific format or encoding, which you did not supply. In rare cases, certain servers will reject the expect-continue flag if it is set to ON.

417 CODE REFERENCES

Rails HTTP Status Symbol :expectation_failed
Go HTTP Status Constant http.StatusExpectationFailed
Symfony HTTP Status ConstantResponse::HTTP_EXPECTATION_FAILED
Python2 HTTP Status Constant httplib.EXPECTATION_FAILED
Python3+ HTTP Status Constant http.client.EXPECTATION_FAILED
Python3.5+ HTTP Status Constanthttp.HTTPStatus.EXPECTATION_FAILED

Conclusion

That should cover all the bases when it comes to HTTP Status code 417-Expectation Failed issues. While there isn’t always much you can do when you get a 417 error, maybe some of these tips will come in handy the next time you get one.

I hope this article was able to help you with your doubts and queries related to the HTTP status code 417 Expectation Failed

Still, if there are any queries related to this topic, feel free to ask in the comment section, we would be happy to assist you. Thank you.

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