using groovy http-builder in preemptive mode

Question

When using groovy's http-builder with basic authentication the default behavior is to send an unauthenticated request first and resend the request with credentials after receiving a 401 in the first place. Apache's Httpclient offers preemptive authentication to send the credentials directly on the first request. How can I use preemptive auth in Groovy's http-builder? Any code examples are appreciated.

score 38 · Answer 1 · answered Mar 07 '13 at 20:16

38

You can also solve it groovy style with

http = new RESTClient('http://awesomeUrl/')
http.headers['Authorization'] = 'Basic '+"myUsername:myPassword".getBytes('iso-8859-1').encodeBase64()

answered Mar 07 '13 at 20:16

towe75

1,440
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1

Also, `getBytes('iso-8859-1')` can be replaced by simply `bytes`. – David V Apr 18 '13 at 17:44
@tweber could you please clarify: what is the purpose of the encoding? is it somehow required by base64? or by the Basic auth protocol? Edit: hmm, [this answer](https://stackoverflow.com/a/7243567/1083697) seems to address my question. Haven't wrapped my head around it yet though. Any answer would be appreciated. – andrybak Nov 27 '19 at 14:51

score 34 · Accepted Answer · edited Nov 27 '19 at 16:21

34

Based on a JIRA issue you can do something like that :

def http = new RESTClient('http://awesomeUrl/')

http.client.addRequestInterceptor(new HttpRequestInterceptor() {
    void process(HttpRequest httpRequest, HttpContext httpContext) {
        httpRequest.addHeader('Authorization', 'Basic ' + 'myUsername:myPassword'.bytes.encodeBase64().toString())
    }
})

def response = http.get(path: "aResource")

println response.data.text

edited Nov 27 '19 at 16:21

andrybak

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36

answered Jul 10 '11 at 15:38

Daniel

594
5
7

1

beautiful. I was getting errant (and seemingly harmless, but annoying) 500 errors with Spring Security Grails plugin and basic auth without preemptive mode set. This fixed it. Note I had to add the following imports: import org.apache.http.HttpRequestInterceptor import org.apache.http.protocol.HttpContext import org.apache.http.HttpRequest – ed209 Feb 18 '12 at 03:34

using groovy http-builder in preemptive mode

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