Translation Go htttp Response Code Snippet

This is a creation in Article, where the information may have evolved or changed.

Catalogue [−]

1. Send header only
2. return normal text
3. Return JSON data
4. return XML data
5. File Services
6. Using HTML templates
7. Using HTML templates to generate strings
8. Using nested templates

Original: HTTP Response Snippets for Go by Alex Edwards.

Inspired by Rails layouts and rendering, I think it's a good idea to write a collection of code snippets about the Go HTTP response, which can be used to illustrate the use of common HTTP response in Go Web applications.

Send header only

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Package mainimport ( "Net/http")func Main () { http. Handlefunc ("/", foo) http. Listenandserve (":"nil)}func foo (w http). Responsewriter, R *http. Request) { w.header (). Set ("Server""A Go Web Server") w.writeheader}

Test:

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$ curl-i localhost:http/1.1 okserver:a Go Web servercontent-type:text/plain; charset=utf-80

return normal text

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Package mainimport ( "Net/http")func Main () { http. Handlefunc ("/", foo) http. Listenandserve (":"nil)}func foo (w http). Responsewriter, R *http. Request) { w.write ([]byte("OK")}

Test:

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$ curl-i localhost:http/1.1 Okcontent-type:text/plain; charset=utf-82OK

Return JSON data

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PackageMainImport("Encoding/json" "Net/http")typeProfilestruct{NamestringHobbies []string}funcMain () {http. Handlefunc ("/", foo) http. Listenandserve (":",Nil)}funcFoo (w http. Responsewriter, R *http. Request) {profile: = profile{"Alex", []string{"Snowboarding","Programming"}} js, err: = json. Marshal (Profile)ifErr! =Nil{http. Error (W, err. Error (), HTTP. Statusinternalservererror)return} w.header (). Set ("Content-type","Application/json") W.write (JS)}

Test:

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$ curl-i localhost:http/1.1, "Name":"Alex", Hobbies": ["Snowboarding","programming"]}

return XML data

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PackageMainImport("Encoding/xml" "Net/http")typeProfilestruct{NamestringHobbies []string ' xml: ' Hobbies>hobby '}funcMain () {http. Handlefunc ("/", foo) http. Listenandserve (":",Nil)}funcFoo (w http. Responsewriter, R *http. Request) {profile: = profile{"Alex", []string{"Snowboarding","Programming"}} x, err: = XML. Marshalindent (Profile,""," ")ifErr! =Nil{http. Error (W, err. Error (), HTTP. Statusinternalservererror)return} w.header (). Set ("Content-type","Application/xml") W.write (x)}

Test:

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$ curl-i localhost:http/1.1<Profile> <name>alex </Name> <Hobbies> <Hobby>snowboarding</Hobby> <Hobby>programming< /hobby> </Hobbies></Profile>

File Services

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Package mainimport ( "net/http" "path")func Main () { http . Handlefunc ("/", foo) http. Listenandserve (":"nil)}func foo (w http). Responsewriter, R *http. Request) { //Assuming want to serve a photo at ' Images/foo.png ' fp: = path. Join ("Images""foo.png") http. Servefile (W, R, FP)}

Test:

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$ curl-i localhost:http/1.1-236717: : + GMT

Using HTML templates

Template file: templates/index.html

Templates/index.html

12	<H1>Hello {{. Name}}</h1><p>Lorem ipsum dolor sit amet, consectetur adipisicing Elit. </P>

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PackageMainImport("Html/template" "Net/http" "Path")typeProfilestruct{NamestringHobbies []string}funcMain () {http. Handlefunc ("/", foo) http. Listenandserve (":",Nil)}funcFoo (w http. Responsewriter, R *http. Request) {profile: = profile{"Alex", []string{"Snowboarding","Programming"}} fp: = path. Join ("Templates","Index.html") Tmpl, err: = template. Parsefiles (FP)ifErr! =Nil{http. Error (W, err. Error (), HTTP. Statusinternalservererror)return}ifERR: = Tmpl. Execute (w, profile); Err! =Nil{http. Error (W, err. Error (), HTTP. Statusinternalservererror)}}

Test:

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$ curl-i localhost:http/1.1 okcontent-type:text/html; charset=utf-8

Using HTML templates to generate strings

In addition to the above http.ResponseWriter as the template of the execution parameters, you can also use buffer to get the result of rendering.

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New (bytes. Buffer)ifnil { http. Error (W, err. Error (), HTTP. Statusinternalservererror)}templatestring: = buf. String () ...

Using nested templates

Files: templates/layout.html

templates/layout.html

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Files: templates/index.html

templates/index.html

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{{define ' title '}} An example layout{{end}} {{define "content"}}<h1>Hello {{. Name}}</h1><p>Lorem ipsum dolor sit amet, consectetur adipisicing Elit. </P> {{End}}

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PackageMainImport("Html/template" "Net/http" "Path")typeProfilestruct{NamestringHobbies []string}funcMain () {http. Handlefunc ("/", foo) http. Listenandserve (":",Nil)}funcFoo (w http. Responsewriter, R *http. Request) {profile: = profile{"Alex", []string{"Snowboarding","Programming"}} LP: = Path. Join ("Templates","Layout.html") fp: = path. Join ("Templates","Index.html")//Note that the layout file must is the first parameter in ParsefilesTmpl, err: = template. Parsefiles (LP, FP)ifErr! =Nil{http. Error (W, err. Error (), HTTP. Statusinternalservererror)return}ifERR: = Tmpl. Execute (w, profile); Err! =Nil{http. Error (W, err. Error (), HTTP. Statusinternalservererror)}}

Test:

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$ curl-i localhost:http/1.1 okcontent-type:text/html; charset=utf-8