Cannot send non-SOAP rate request to FedEx - integration

Question

Trying to send non-SOAP rate request to FedEx. The following XML works with SOAP Env and Body when I send their SOAP endpoint. It says in the documentation that they offer an XML-only solution, and that is formatted exactly the same as the SOAP request. Sending to https://wsbeta.fedex.com:443/xml. Please let me know if anyone has any insight.
<RateRequest>
<WebAuthenticationDetail>
<UserCredential>
<Key>omitted</Key>
<Password>omitted</Password>
</UserCredential>
</WebAuthenticationDetail>
<ClientDetail>
<AccountNumber>omitted</AccountNumber>
<MeterNumber>omitted</MeterNumber>
</ClientDetail>
<Version>
<ServiceId>crs</ServiceId>
<Major>28</Major>
<Intermediate>0</Intermediate>
<Minor>0</Minor>
</Version>
<RequestedShipment>
<ServiceType>FEDEX_2_DAY</ServiceType>
<Shipper>
<Address>
<StreetLines>4500 WEST 46TH STREET</StreetLines>
<City>CHICAGO</City>
<StateOrProvinceCode>IL</StateOrProvinceCode>
<PostalCode>60632</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</Shipper>
<Recipient>
<Address>
<City>TAMPA</City>
<StateOrProvinceCode>FL</StateOrProvinceCode>
<PostalCode>33616</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</Recipient>
<PackageCount>1</PackageCount>
<RequestedPackageLineItems>
<SequenceNumber>1</SequenceNumber>
<GroupPackageCount>1</GroupPackageCount>
<Weight>
<Units>LB</Units>
<Value>10</Value>
</Weight>
</RequestedPackageLineItems>
</RequestedShipment>
</RateRequest>

Answer 1

It looks like you're almost there. The root element of your xml document is missing the namespace http://fedex.com/ws/rate/v28.
In a SOAP message the namespace would be defined on the Envelope element. Because the data sent via the plain XML interface does not contain the wrapping Envelope and Body tags that are specific to SOAP, you have to add the namespace to the RateRequest element.
Your request should then be:
<RateRequest xmlns="http://fedex.com/ws/rate/v28">
<WebAuthenticationDetail>
<UserCredential>
<Key>omitted</Key>
<Password>omitted</Password>
</UserCredential>
</WebAuthenticationDetail>
<ClientDetail>
<AccountNumber>omitted</AccountNumber>
<MeterNumber>omitted</MeterNumber>
</ClientDetail>
<Version>
<ServiceId>crs</ServiceId>
<Major>28</Major>
<Intermediate>0</Intermediate>
<Minor>0</Minor>
</Version>
<RequestedShipment>
<ServiceType>FEDEX_2_DAY</ServiceType>
<Shipper>
<Address>
<StreetLines>4500 WEST 46TH STREET</StreetLines>
<City>CHICAGO</City>
<StateOrProvinceCode>IL</StateOrProvinceCode>
<PostalCode>60632</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</Shipper>
<Recipient>
<Address>
<City>TAMPA</City>
<StateOrProvinceCode>FL</StateOrProvinceCode>
<PostalCode>33616</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</Recipient>
<PackageCount>1</PackageCount>
<RequestedPackageLineItems>
<SequenceNumber>1</SequenceNumber>
<GroupPackageCount>1</GroupPackageCount>
<Weight>
<Units>LB</Units>
<Value>10</Value>
</Weight>
</RequestedPackageLineItems>
</RequestedShipment>
</RateRequest>
Also, don't forget to set the following headers in your request:
Accept: image/gif, image/jpeg, image/pjpeg, text/plain, text/html, */*
Content-Type: text/xml