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6.Other_Debugging_Tools.md

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Other Debugging Tools

RealHTTP provides a set of tools you can use to debug issues with your network communication.

cURL Command Output

Debugging platform issues can be frustrating.
RealHTTP allows you to produce the equivalent cURL representation of any HTTPRequest instance for easy debugging.

let client: HTTPClient= ...
let request =  HTTPRawRequest().resourceAtURL("http://...")

// Print the cURL representation of the request
print(request.cURLDescription(whenIn: client))

This should produce:

$ curl -v \
	-X GET \
	-H "Accept-Language: en;q=1.0, it-US;q=0.9" \
	-H "User-Agent: HTTPDemo/1.0 (com.danielemargutti.HTTPDemo; build:1; iOS 14.5.0) RealHTTP/0.9.0" \
	-H "Accept-Encoding: br;q=1.0, gzip;q=0.9, deflate;q=0.8" \
	"http://ipv4.download.thinkbroadband.com/5MB.zip"

Monitor Connection Metrics

RealHTTP gathers URLSessionTaskMetrics statistics for every HTTPRequest. URLSessionTaskMetrics encapsulates detailed information about the underlying network connection and request and response timing.
This information may be really useful for spotting bottlenecks in your communication or for gathering statistics on network usage.

You can find this information inside the HTTPRawResponse's metrics property. It returns an HTTPRequestMetrics instance with the following info:

  • task: origin URLSessionTask of the metrics.
  • redirectCount number of redirects before obtaining the response.
  • taskInterval total time spent executing the task.
  • metrics: a list of transaction metrics entries.

Each item of the metrics property can be expanded into an HTTPMetric.Stage object which describes the type of operation (domainLookup, connect, secureConnection, request, server, response, total) along with the respective interval (start, end, and duration).

This kind of data can be tricky to read so RealHTTP allows you to print a console-friendly graphical representation using the render() function:

let req = HTTPRequest {
    $0.url = URL(string: "http://ipv4.download.thinkbroadband.com/5MB.zip")!
    $0.transferMode = .largeData
    $0.method = .get
}
        
req.$progress.sink { progress in
    print("Downloading \(progress?.percentage ?? 0)")
}.store(in: &observerBag)
        
let response = try await req.fetch(client)
print(response.metrics?.render() ?? "")

Print the following result on console:

RealHTTP