In Go s http package how do I get the query string on a POST request

Question

I m using the httppackage from Go to deal with POST request  How can I access and parse the content of the query string from the Requestobject   I can t find the answer from the official documentation

User · Accepted Answer

A QueryString is  by definition  in the URL  You can access the URL of the request using req URL  doc   The URL object has a Query   method  doc  that returns a Values type  which is simply a map string   string of the QueryString parameters   If what you re looking for is the POST data as submitted by an HTML form  then this is  usually  a key-value pair in the request body  You re correct in your answer that you can call ParseForm   and then use req Form field to get the map of key-value pairs  but you can also call FormValue key  to get the value of a specific key  This calls ParseForm   if required  and gets values regardless of how they were sent  i e  in query string or in the request body

User · Answer

Below is an example   value    r FormValue  field     for more info  about http package  you could visit its documentation here   FormValue basically returns POST or PUT values  or GET values  in that order  the first one that it finds

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There are two ways of getting query params    Using reqeust URL Query   Using request Form   In second case one has to be careful as body parameters will take precedence over query parameters  A full description about getting query params can be found here  https   golangbyexample com net-http-package-get-query-params-golang

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Here s a more concrete example of how to access GET parameters  The Request object has a method that parses them out for you called Query   Assuming a request URL like http   host port something param1 b  func newHandler w http ResponseWriter  r  http Request      fmt Println  GET params were    r URL Query          if only one expected   param1    r URL Query   Get  param1     if param1                    process it  will be the first  only  if multiple were given        note  if they pass in like  param1  amp param2  param1 will also be                 if multiples possible  or to process empty values like param1 in       param1  amp param2 something   param1s    r URL Query    param1     if len param1s   gt  0              process them     or you could just iterate over them without a check        this way you can also tell if they passed in the parameter as the empty string        it will be an element of the array that is the empty string             Also note  the keys in a Values map  i e  Query   return value  are case-sensitive

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Here s a simple  working example   package main  import        io       net http    func queryParamDisplayHandler res http ResponseWriter  req  http Request        io WriteString res   name    req FormValue  name        io WriteString res    nphone    req FormValue  phone       func main         http HandleFunc   example   func res http ResponseWriter  req  http Request            queryParamDisplayHandler res  req             println  Enter this in your browser   http   localhost 8080 example name jenny amp phone 867-5309       http ListenAndServe   8080   nil

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Below words come from the official document      Form contains the parsed form data  including both the URL field s query parameters and the POST or PUT form data  This field is only available after ParseForm is called    So  sample codes as below would work   func parseRequest req  http Request  error       var err error      if err   req ParseForm    err    nil           log Error  Error parsing form   s   err          return err                req Form Get  xxx        return nil

[go] In Go's http package, how do I get the query string on a POST request?

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