CODEWITHSUNDEEP
go
Nikola Stanković
Nikola Stanković

Reputation: 881

How to obtain all request headers in Go

How can I obtain all available http headers from a request as array in Go? I see only the following two methods:

But in this case I need to know the name of the Header and can't return all existing headers. I'd like to copy the http headers from one request to anther one.

Upvotes: 33

Views: 45159

Answers (3)

Abhishek Srivastava
Abhishek Srivastava

Reputation: 561

You can use above approaches if you want to loop one by one through all headers. If you want to print all headers in one line you can,

if reqHeadersBytes, err := json.Marshal(req.Header); err != nil {
    log.Println("Could not Marshal Req Headers")
} else {
    log.Println(string(reqHeadersBytes))
}

Upvotes: 11

Thundercat
Thundercat

Reputation: 120941

Use Request.Header to access all headers. Because Header is a map[string][]string, two loops are required to access all headers.

// Loop over header names
for name, values := range r.Header {
    // Loop over all values for the name.
    for _, value := range values {
        fmt.Println(name, value)
    }
}

Upvotes: 67

Adrian
Adrian

Reputation: 46433

As you can see from the documentation, Header is just a map[string][]string with some extra helper methods, so you can still use it like any map to access its keys:

for key,val := range req.Header {
    // Logic using key
    // And val if you need it
}

Upvotes: 7

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