feat: error event now includes response headers (#35)

Author: tanderson-ld

lib/eventsource.js

@@ -221,7 +221,7 @@ function EventSource (url, eventSourceInitDict) {
       if (res.statusCode === 301 || res.statusCode === 307) {
         if (!res.headers.location) {
           // Server sent redirect response without Location header.
-          failOnce({ status: res.statusCode, message: res.statusMessage })
+          failOnce({ status: res.statusCode, headers: res.headers, message: res.statusMessage })
           return
         }
         if (res.statusCode === 307) reconnectUrl = url
@@ -232,7 +232,7 @@ function EventSource (url, eventSourceInitDict) {
 
       // Handle HTTP errors
       if (res.statusCode !== 200) {
-        failOnce({ status: res.statusCode, message: res.statusMessage })
+        failOnce({ status: res.statusCode, headers: res.headers, message: res.statusMessage })
         return
       }
 

test/eventsource_test.js

@@ -540,6 +540,7 @@ describe('HTTP Request', () => {
           const errors = startErrorQueue(es)
           const err = await errors.take()
           assert.equal(err.status, status)
+          assert.notEqual(err.headers, undefined)
         })
       })
     })