![]() In either case, the log.Fatal() function will log the error value if there is one. If the server has started correctly, the function only returns when the server is terminated. The ListenAndServe() returns immediately with an error value if there is an error when starting the server. We will specify nil as the value for the handler and thus our function call to ListenAndServe is as follows: log.Fatal(http.ListenAndServe(listenAddr, nil)) Next, we call the ListenAndServe() function specifying the address to listen on ( listenAddr ) and the handler for the server. It is a good idea to make this address configurable. Thus, in the main() function, the following lines check if the LISTEN_ADDR environment variable has been specified, and if not, it defaults to " :8080" Log.Fatal(http.ListenAndServe(listenAddr, nil))Įxplanation: The ListenAndServe() function in the net/http package starts an HTTP server at a given network address. Let us create a basic HTTP server which will listen on a pre-defined port number. If not, it returns an HTTP error as a response to the client.Ĭreate your first HTTP web server using golang If the answer is yes, the server calls a handler function to process the request and return the response.The server checks if it can handle this request.The server receives a client request at a certain path, say /api.A server running on your computer, available at would process a request as follows: ![]() The net/http package gives us the building blocks for writing an HTTP server. You will learn how handler functions work, discover more about processing requests, and study how to read and write streaming data. Please let me know in the comments section below.In this tutorial, we will dive into the basics of writing HTTP servers. Note - If you found this tutorial useful or require any further help then Looked at how you can unmarshal the JSON response into struct objects that weĬan effectively work with as if they were normal objects. In this tutorial, we’ve looked at how you can perform GET requests on HTTPĮndpoints and print out the plain text response of the response. Package main import ( "fmt" "io/ioutil" "log" "net/http" "os" ) func main () Summary So in order to mimic what we’ve just done in the browser in go, we’ll have to Note - When you open a web page in a browser, you are performing a GET Should see a huge JSON string printing out, this is the response we’ll beĮxpecting when our go program performs a GET request on this endpoint. If you navigate to this endpoint in your browser you To get us started we are going to query for all the Pokemon from the originalĮndpoint that returns this. You will need Go version 1.11+ installed on your development machine.Requires no authentication so there is no barrier to entry. Know but it’s a fully fledged API that follows standard naming conventions and We’ll beĮxposes all the known information for everything Pokemon related. Live API that we can easily test to see if it works in our browser. Github that lists all the public APIs that are available for consumption by usĪnd he’s categorized them so that we can easily drill down to what we want toįor the purpose of this tutorial though, I feel that we should use an already Todd Motto has put together quite an active repo on Open REST APIs out there that are just waiting to be consumed and turned into There are currently hundreds upon thousands of In this tutorial, I’m going to be demonstrating how we can consume an already Note - For a Tutorial on how to build a RESTful API in Go click
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