Merge pull request #470 from linkeddata/fix-options-headers

Fix options.headers

Author: bourgeoa

src/fetcher.ts

@@ -1031,7 +1031,7 @@ export default class Fetcher implements CallbackifyInterface {
     options.baseURI = options.baseURI || uri // Preserve though proxying etc
     options.original = kb.rdfFactory.namedNode(options.baseURI)
     options.req = kb.bnode()
-    options.headers = options.headers || new Headers
+    options.headers = options.headers || new Headers()
 
     if (options.contentType) {
       options.headers['content-type'] = options.contentType
@@ -1122,6 +1122,14 @@ export default class Fetcher implements CallbackifyInterface {
 
     let { actualProxyURI } = options
 
+    // Map might get mistakenly added into headers
+    // error TS2339: Property 'map' does not exist on type 'Headers'.
+    /*
+    let map
+    if (options.headers && map in options.headers) {
+      delete options.headers.map
+    } */
+
     return this._fetch((actualProxyURI as string), options)
       .then(response => this.handleResponse(response, docuri, options),
       error => { // @@ handleError?