Ocassional error 400 when sending requests in golang - http

Question

Here's what I have right now:
func (client Client) PressButton(i int, k int, msg Message) error {
if client.Token == "" {
return fmt.Errorf("no token")
}
i--
k--
url := "https://discord.com/api/v9/interactions"
time.Sleep(2 * time.Second)
data := map[string]interface{}{"component_type": msg.Components[i].Buttons[k].Type, "custom_id": msg.Components[i].Buttons[k].CustomID, "hash": msg.Components[i].Buttons[k].Hash}
values := map[string]interface{}{"application_id": "270904126974590976", "channel_id": msg.ChannelID, "type": "3", "data": data, "guild_id": msg.GuildID, "message_flags": 0, "message_id": msg.ID,}
json_data, err := json.Marshal(values)
if err != nil {
return fmt.Errorf("error while encoding button click as json: %v", err)
}
req, err := http.NewRequest("POST", url, strings.NewReader(string(json_data)))
if err != nil {
return fmt.Errorf("error while creating http request: %v", err)
}
req.Header.Set("authorization", client.Token)
req.Header.Set("Content-Type", "application/json")
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
if err != nil {
return fmt.Errorf("error while sending http request: %v", err)
}
if resp.StatusCode != 204 {
switch resp.StatusCode {
case http.StatusUnauthorized:
return ErrUnauthorized
case http.StatusForbidden:
return ErrForbidden
case http.StatusNotFound:
return ErrNotFound
case http.StatusTooManyRequests:
return ErrTooManyRequests
case http.StatusInternalServerError:
return ErrIntervalServer
default:
return fmt.Errorf("unexpected status code while clicking button: %v", resp.StatusCode)
}
}
return nil
}
This works perfectly 90% of the times. But sometimes I get an error 400. I looked it up, I tried every recommended solution, I have confirmed that the payload and the URL are absolutely right moreover it wouldn't work most of the times if they weren't. I've also tried changing the headers among other things.
Here's an example payload that was sent (Before Marshaling) :
map[application_id:12345 channel_id:872747211551801384 data:map[component_type:2 custom_id:c34117ee-a332-4d7c-888f-47081e40092f:0 hash:]
(Changed the application id)
Response status is 400, here's the response body:
{"code": 50035, "errors": {"data": {"_errors": [{"code": "COMPONENT_VALIDATION_FAILED", "message": "Component validation failed"}]}}, "message": "Invalid Form Body"}
I've absolutely scavanged the internet and coding servers on discord to understand why this is happening.
The hash is always an empty field now, earlier it used to have a value for my use-case. I just left it in so it's more generalized.