How can multiple requests be combined into one or ensured to execute sequentially?

In Go, there are several approaches to combine multiple requests into one or ensure their sequential execution:

1. Sequential execution: simply call the request functions one after another, waiting for each to complete before the next.

resp1, err := client.Do(req1)
if err != nil {
    // handle error
}
resp2, err := client.Do(req2)
// and so on

2. Parallel execution with waiting: launch requests in goroutines and use sync.WaitGroup to wait for their completion.

var wg sync.WaitGroup
wg.Add(2)
go func() {
    defer wg.Done()
    client.Do(req1)
}()
go func() {
    defer wg.Done()
    client.Do(req2)
}()
wg.Wait()

3. Combining requests: if the API supports it, you can combine multiple requests into one (for example, batch request), but this depends on the server.

Thus, the choice depends on the requirements: whether sequentiality or parallelism is needed, and whether the server supports request aggregation.