One allows you to initialize capacity, one allows you to initialize values:

    // Initializes a map with space for 15 items before reallocation
    m := make(map[string]int32, 15)

vs

    // Initializes a map with an entry relating the name &quot;bob&quot; to the number 5
    m := map[string]int{&quot;bob&quot;: 5} 

For an empty map with capacity 0, they&#39;re the same and it&#39;s just preference.

I have an MVC webapi site that uses OAuth/token authentication to authenticate requests. All the relevant controllers have the right attributes, and authentication is working ok. 

The problem is that not all of the request can be authorised in the scope of an attribute - some authorisation checks have to be performed in code that is called by controller methods - what is the correct way to return a 401 unauthorised response in this case?

I have tried `throw new HttpException(401, &quot;Unauthorized access&quot;);`, but when I do this the response status code is 500 and I get also get a stack trace. Even in our logging DelegatingHandler we can see that the response is 500, not 401. 



ASP.NET Web API : Correct way to return a 401/unauthorised response

I have read in an XML email attachment with

    bytes_string=part.get_payload(decode=False)

The payload comes in as a byte string, as my variable name suggests.

I am trying to use the recommended Python 3 approach to turn this string into a usable string that I can manipulate.

The example shows:

&gt;     str(b&#39;abc&#39;,&#39;utf-8&#39;)

How can I apply the `b` (bytes) keyword argument to my variable `bytes_string` and use the recommended approach?

The way I tried doesn&#39;t work:

    str(bbytes_string, &#39;utf-8&#39;)

How do I convert a Python 3 byte-string variable into a regular string?

As `map` is a reference type. What is difference between:?

    m := make(map[string]int32)

and

    m := map[string]int32{}

Which is the nicer way to initialize a map?

As <code>map</code> is a reference type. What is difference between:?
<pre><code class="hljs language-go">m := make(map[string]int32)
</code></pre>
and
<pre><code class="hljs language-go">m := map[string]int32{}
</code></pre>

I&#39;ve been having a hard time trying to execute a simple golang program in a virtual machine powered by vagrant.
These are the relevant fields of my `go env`:

    GOARCH=&quot;amd64&quot;
    GOPATH=&quot;/usr/local/src/go&quot;
    GOROOT=&quot;/usr/local/go&quot;
    GOTOOLDIR=&quot;/usr/local/go/pkg/tool/linux_amd64&quot;

This is the program I&#39;m trying to execute ( located in /usr/local/src/go/program ):

    package program

    import (
        &quot;fmt&quot;
    )

    func main() {
        fmt.Print(&quot;Aloha&quot;)
    }

This, the output that I get:

    main.go:4:5:
    /usr/local/go/src/fmt/doc.go:1:1: expected &#39;package&#39;, found &#39;EOF&#39;
    package runtime:
    /usr/local/go/src/runtime/alg.go:1:1: expected &#39;package&#39;, found &#39;EOF&#39;

Take into account that this is a completely fake program. The weird thing is that it totally works in a different environment.
What am I missing here?

Thanks a lot!

Go failing - expected &#39;package&#39;, found &#39;EOF&#39;

How do I access an array item (e.g. a[2]) in templates?

Whenever I do this I get &quot;bad character U+005B &#39;[&#39;&quot;

    {{ .a[2] }}

Go templates: How do I access array item (arr[2]) in templates?

I am pulling and installing a package with dependencies, and a compilation fails, in this case not finding a file, `magic.h`.   How do I see what the compilation commands and flags were? The `-v` option does not help. (I do NOT want ideas about where to get magic.h from, this is just an example.)

&lt;!-- language: lang-bash --&gt;

    $ go get -u github.com/presbrey/magicmime
    # github.com/presbrey/magicmime
    ../../../src/github.com/presbrey/magicmime/magicmime.go:20:11: fatal error:   &#39;magic.h&#39; file not found
    #include &lt;magic.h&gt;

How can I find, for example, where it was looking for include files, what source *exactly* it was compiling? (In this case the source file I see in `$GO_PATH/src` has that `#include` commented out, and a `/usr/local/include/match.h` exists anyway.)

How can I see the internal compile commands which fail in a &quot;go get&quot; installation?

I want to test a few functions that are included in my main package, but my tests don&#39;t appear to be able to access those functions.

My sample main.go file looks like:

    package main
    
    import (
    	&quot;log&quot;
    )
    
    func main() {
    	log.Printf(foo())
    }
    
    func foo() string {
    	return &quot;Foo&quot;
    }

and my main_test.go file looks like:

    package main
    
    import (
    	&quot;testing&quot;
    )
    
    func Foo(t testing.T) {
    	t.Error(foo())
    }

when I run `go test main_test.go` I get

    # command-line-arguments
    .\main_test.go:8: undefined: foo
    FAIL    command-line-arguments [build failed]

As I understand, even if I moved the test file elsewhere and tried importing from the main.go file, I couldn&#39;t import it, since it&#39;s `package main`.

What is the correct way of structuring such tests? Should I just remove everything from the `main` package asides a simple main function to run everything and then test the functions in their own package, or is there a way for me to call those functions from the main file during testing?

How to test the main package functions in golang?

In Go, is there a way to satisfy an interface anonymously? It doesn&#39;t seem like there is, but this was my best attempt.

(In the [Playground][1])

    package main

    import &quot;fmt&quot;

    type Thing interface {
        Item() float64
        SetItem(float64)
    }

    func newThing() Thing {
        item := 0.0
        return struct {
            Item (func() float64)
            SetItem (func(float64))
        }{
            Item: func() float64 { return item },
            SetItem: func(x float64) { item = x },
        }
    }

    func main() {
        thing := newThing()
        fmt.Println(&quot;Hello, playground&quot;)
        fmt.Println(thing)
    }


  [1]: http://play.golang.org/p/4i-8o087dg

Content Type	Original Author	Original Content on Stackoverflow
Question	iwat	View Question on Stackoverflow
Solution 1 - Go	Linear	View Answer on Stackoverflow

Which is the nicer way to initialize a map?

Go Problem Overview

Go Solutions

Solution 1 - Go

How do I convert a Python 3 byte-string variable into a regular string?

ASP.NET Web API : Correct way to return a 401/unauthorised response

Attributions