net/http, encoding/json, io and bufio, time, flag, and building simple HTTP services in Go.
35 cards · basic cards · AI-written, checked twice. Edit anything.
- What does http.ListenAndServe() do?
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Starts an HTTP server listening on the specified address and port, blocking until the server exits- What function in net/http registers a handler for a URL pattern?
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http.HandleFunc(pattern, handlerFunc)- What two methods must http.ResponseWriter implement?
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Write([]byte) and Header() http.Header- How do you extract query parameters from a *http.Request?
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Call Request.URL.Query() to get a url.Values, then call Get() on it- What field on *http.Request contains the HTTP method?
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The Method field (e.g., "GET", "POST", "PUT")- What does http.Client.Do() return?
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A *http.Response and an error- When should you use http.Client instead of http.Get()?
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When you need to set custom headers, timeouts, or other request options- What is the http.Handler interface?
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An interface with one method: ServeHTTP(ResponseWriter, *Request)- What constant represents the HTTP status code 200 OK?
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http.StatusOK- What does json.Marshal() return?
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A byte slice containing JSON and an error- What must be the second argument to json.Unmarshal()?
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A pointer to a value, usually a struct pointer- How do you specify a custom JSON key name for a struct field?
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Use a struct tag: `json:"fieldName"`- When should you use json.Encoder instead of json.Marshal()?
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When you are writing JSON to an io.Writer directly, like a file or HTTP response body- When should you use json.Decoder instead of json.Unmarshal()?
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When you are reading JSON from an io.Reader, like a file or HTTP request body- What happens to unexported struct fields when marshaling to JSON?
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They are ignored and not included in the JSON output
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