Refit serialization problem

[gitterdonewell]

Using Refit 7.0
I ran into this issue twice and then only to find out it was a refit issue. I can't seem to pass some of my models to the api. I am unable to directly pass the DateTime or List<Guid> data as argument but I can if I manually serialize them before I pass.

public interface IRefitApiClient 
{
   [HttpPost("/api/xyz/customer/process")]
   [Headers("content-type: application/json")]
   public async Task<int> ProcessCustomers([Body] string customerIds, CancellationToken token);
}

var customerIds= new List<Guid>{ "guid1", "guid2",........};
var foo = JsonSerializer.Serialize(customerIds);
var res = _refitApiClient.ProcessCustomers(foo, cancellationToken);

Instead if I have this:

public interface IRefitApiClient 
{
   [HttpPost("/api/xyz/customer/process")]
   [Headers("content-type: application/json")]
   public async Task<int> ProcessCustomers([Body] IEnumerable<Guids> customerIds, CancellationToken token);
}

I can't do this..

var customerIds= new List<Guid>{ "guid1", "guid2",........};
var res = _refitApiClient.ProcessCustomers(customerIds, cancellationToken);

What's weird is I can only pass a list of 24 GUIDS and if anything more, the web api only sees a null value. On the other hand, if I serialize the list of guids, I can pass 5000 guids.

I ran into similar issue with DateTime type until I converted it to string. This doesn't work at all. I got a malformed json error or similar. The only way I can pass the datetime is if I stringify it first.

public interface IRefitApiClient 
{
   [HttpPost("/api/xyz/customer/process")]
   [Headers("content-type: application/json")]
   public async Task<int> ProcessCustomers([Body] DateTime? apptDate, CancellationToken token);
}

I can't do this..

var foo = DateTime.UtcNow;
var res = _refitApiClient.ProcessCustomers(foo, cancellationToken);

Why is this happening? and how can I fix it. I like refit but issues like this doesn't give me much confidence.

[gitterdonewell]

I think I figured out the issue with the List<Guid> model problem. I had to add Buffered: true to the Body attribute.

public interface IRefitApiClient 
{
   [HttpPost("/api/xyz/customer/process")]
   [Headers("content-type: application/json")]
   public async Task<int> ProcessCustomers([Body(Buffered: true)] IEnumerable<Guids> customerIds, CancellationToken token);
}

Why is this not a default?! I wasted so many hours trying so many things. Please make it a default. If someone wants to stream their content, let them explicitly set it.