diff --git a/.eslintrc b/.eslintrc
index 67f0307..e5b460e 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -21,7 +21,7 @@
     "strict": 1,
     "new-cap": 0,
     "camelcase": 0,
-    "comma-dangle": 1,
+    "comma-dangle": 0,
     "no-unused-vars": 1,
     "comma-spacing": 1,
     "space-infix-ops": 1,
diff --git a/src/index.ts b/src/index.ts
index 21e80b4..2bd02fb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -515,16 +515,27 @@ class DicoogleAccess {
    * @param callback the function to call on completion
    */
   unindex(uri: string | string[], provider: string | string[], callback?: (error: any) => void): Promise<void>;
-  unindex(uri: string | string[], provider: string | string[] | ((error: any) => void), callback?: (error: any) => void) {
+  unindex(uri: string | string[], provider?: string | string[] | ((error: any) => void), callback?: (error: any) => void) {
     if (typeof provider === 'function' && !callback) {
       callback = provider;
       provider = undefined;
     }
-    return andCallVoid(this.request('POST', Endpoints.UNINDEX)
-      .query({
-        uri,
-        provider
-      }), callback);
+
+    if (Array.isArray(uri) && uri.length > 1) {
+      // send URIs as form data to prevent URI from being too long
+      let body = uri.map(uri => 'uri=' + encodeURIComponent(uri)).join('&');
+
+      return andCallVoid(this.request('POST', Endpoints.UNINDEX)
+        .type('form')
+        .query({provider})
+        .send(body), callback);
+    } else {
+      return andCallVoid(this.request('POST', Endpoints.UNINDEX)
+        .query({
+          uri,
+          provider
+        }), callback);
+    }
   };
 
   /** Request that the file at the given URI is permanently removed. The operation, unlike index(), is not recursive.
@@ -533,10 +544,17 @@ class DicoogleAccess {
    * @param callback the function to call on completion
    */
   remove(uri: string | string[], callback?: (error: any) => void): Promise<void> {
-    return andCallVoid(this.request('POST', Endpoints.REMOVE)
-      .query({
-        uri
-      }), callback);
+    if (Array.isArray(uri) && uri.length > 1) {
+      // send URIs as form data to prevent URI from being too long
+      return andCallVoid(this.request('POST', Endpoints.REMOVE)
+        .type('form')
+        .send(uri.map(uri => 'uri=' + encodeURIComponent(uri)).join('&')), callback);
+    } else {
+      return andCallVoid(this.request('POST', Endpoints.REMOVE)
+        .query({
+          uri
+        }), callback);
+    }
   };
 
   /** Retrieve the running Dicoogle version.
diff --git a/src/util.ts b/src/util.ts
index add30e8..f9b7766 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -25,7 +25,7 @@ export function isDicomUUID(uid: string): boolean {
     return uid.length <= 64 && uid.match(/^\d+(\.\d+)*$/) !== null;
 }
 
-export function andCall<T>(promise: Promise<T>, callback?: (error: any, outcome?: T) => void): Promise<T> {
+export function andCall<T>(promise: Promise<T>, callback: (error: any, outcome?: T) => void | undefined): Promise<T> {
     if (callback) {
         promise.then(
             (value) => callback(null, value),
@@ -34,7 +34,7 @@ export function andCall<T>(promise: Promise<T>, callback?: (error: any, outcome?
     return promise;
 }
   
-export function andCallVoid(promise: Promise<any>, callback?: (error: any) => void): Promise<void> {
+export function andCallVoid(promise: Promise<any>, callback: (error: any) => void | undefined): Promise<void> {
     if (callback) {
         promise.then(
             () => callback(null),
diff --git a/test/.eslintrc b/test/.eslintrc
index fd94e60..ead9d97 100644
--- a/test/.eslintrc
+++ b/test/.eslintrc
@@ -21,7 +21,7 @@
     "global-strict": 0,
     "new-cap": 0,
     "camelcase": 0,
-    "comma-dangle": 1,
+    "comma-dangle": 0,
     "no-unused-vars": 1,
     "comma-spacing": 1,
     "space-infix-ops": 1,
diff --git a/test/mock/service-mock.js b/test/mock/service-mock.js
index dfdf790..4e9e51c 100644
--- a/test/mock/service-mock.js
+++ b/test/mock/service-mock.js
@@ -22,6 +22,13 @@ const nock = require('nock');
 const URL = require('url');
 const qs = require('querystring');
 
+function validateURI(uri) {
+    if (typeof uri !== 'string') {
+        return false;
+    }
+    return /^(file:)?[\.-\w\/\%\?\&\=]+$/.test(uri);
+}
+
 /** Use nock to intercept Dicoogle client requests.
  * @param {number} [port] the TCP port to listen to
  * @returns {object} a Dicoogle access object Dicoogle access object connected to a mock Dicoogle server.
@@ -34,7 +41,7 @@ module.exports = function createDicoogleMock(port = 8080) {
 
         const SEARCH_RESULTS = [
             {
-                uri: '/opt/dataset/file1',
+                uri: 'file:/opt/dataset/file1',
                 fields: {
                     "Modality": "MR",
                     "StudyInstanceUID": "1.2.3.4.5.6.7777777",
@@ -48,7 +55,7 @@ module.exports = function createDicoogleMock(port = 8080) {
                 }
             },
             {
-                uri: '/opt/dataset/file2',
+                uri: 'file:/opt/dataset/file2',
                 fields: {
                     "Modality": "MR",
                     "StudyInstanceUID": "1.2.3.4.5.6.7777777",
@@ -79,10 +86,10 @@ module.exports = function createDicoogleMock(port = 8080) {
                         serieDescription: "",
                         serieModality: "CR",
                         images: [{
-                            uri: '/opt/dataset/file1',
+                            uri: 'file:/opt/dataset/file1',
                             "sopInstanceUID": "1.2.3.4.5.6.7777777.4444.1"
                         }, {
-                                uri: '/opt/dataset/file2',
+                                uri: 'file:/opt/dataset/file2',
                                 "sopInstanceUID": "1.2.3.4.5.6.7777777.4444.2"
                             }]
                     }]
@@ -299,27 +306,50 @@ module.exports = function createDicoogleMock(port = 8080) {
 
             // mock index on specific provider
             .post('/management/tasks/index')
-            .query({ uri: /[a-z0-9\-/]+/, plugin: /.*/ })
+            .query(({ uri, plugin }) => {
+                return validateURI(uri) && /\w+/.test(plugin);
+            })
             .reply(200)
 
             // mock index on all providers
             .post('/management/tasks/index')
-            .query({ uri: /[a-z0-9\-/]+/ })
+            .query(({ uri }) => validateURI(uri))
             .reply(200)
 
-            // mock unindex on all providers
+            // mock unindex on all providers (via query string)
             .post('/management/tasks/unindex')
-            .query({ uri: /[a-z0-9\-/]+/ })
+            .query(({ uri }) => validateURI(uri))
+            .reply(200)
+
+            // mock unindex on all providers (via form data)
+            .post('/management/tasks/unindex', ({ uri: uris }) => {
+                return uris.length > 0 && uris.every(validateURI);
+            })
             .reply(200)
 
-            // mock unindex on specific provider
+            // mock unindex on specific provider (via query string)
             .post('/management/tasks/unindex')
-            .query({ uri: /[a-z0-9\-/]+/, provider: /.*/ })
+            .query(({ uri, plugin }) => {
+                return validateURI(uri) && /\w+/.test(plugin);
+            })
             .reply(200)
 
-            // mock remove
+            // mock unindex on specific provider (via form data)
+            .post('/management/tasks/unindex', ({ uri: uris }) => {
+                return uris.length > 0 && uris.every(validateURI);
+            })
+            .query({ provider: /\w+/ })
+            .reply(200)
+        
+            // mock remove (via query string)
             .post('/management/tasks/remove')
-            .query({ uri: /[a-z0-9\-/]+/ })
+            .query(({ uri }) => validateURI(uri))
+            .reply(200)
+
+            // mock remove (via form data)
+            .post('/management/tasks/remove', ({ uri: uris }) => {
+                return uris.length > 0 && uris.every(validateURI);
+            })
             .reply(200)
 
             // mock dump
diff --git a/test/test-base-promise.js b/test/test-base-promise.js
index 28ea632..c57653c 100644
--- a/test/test-base-promise.js
+++ b/test/test-base-promise.js
@@ -204,7 +204,7 @@ describe('Dicoogle Client, Promise API (under Node.js)', function() {
 
     describe('#index() on all providers', function() {
       it("should say ok with no error", async function() {
-        await dicoogle.index('/opt/another-dataset');
+        await dicoogle.index('file:/opt/another-dataset');
       });
     });
   });
@@ -212,20 +212,40 @@ describe('Dicoogle Client, Promise API (under Node.js)', function() {
   describe('Unindex', function() {
     describe('#unindex() on one provider', function() {
       it("should say ok with no error", async function() {
-        await dicoogle.unindex('/opt/another-dataset/1_1.dcm', 'lucene');
+        await dicoogle.unindex('file:/opt/another-dataset/1_1.dcm', 'lucene');
       });
     });
 
     describe('#unindex() on all providers', function() {
       it("should say ok with no error", async function() {
-        await dicoogle.unindex('/opt/another-dataset/1_1.dcm');
+        await dicoogle.unindex('file:/opt/another-dataset/1_1.dcm');
+      });
+    });
+
+    describe('#unindex() multiple URIs', function() {
+      it("should say ok with no error", async function() {
+        await dicoogle.unindex([
+          'file:/opt/another-dataset/1_1.dcm',
+          'file:/opt/another-dataset/1_2.dcm',
+        ]);
       });
     });
   });
 
-  describe('#remove() a file', function() {
-    it("should say ok with no error", async function() {
-      await dicoogle.remove('/opt/another-dataset/1_1.dcm');
+  describe("Remove", function() {
+    describe('#remove() a file', function() {
+      it("should say ok with no error", async function() {
+        await dicoogle.remove('file:/opt/another-dataset/1_1.dcm');
+      });
+    });
+    describe('#remove() multiple files', function() {
+      it("should say ok with no error", async function() {
+        await dicoogle.remove([
+          'file:/opt/another-dataset/1_1.dcm',
+          'file:/opt/another-dataset/1_2.dcm',
+          'file:/opt/another-dataset/1_3.dcm',
+        ]);
+      });
     });
   });
 
diff --git a/test/test-base.js b/test/test-base.js
index cc2e3af..f593ef3 100644
--- a/test/test-base.js
+++ b/test/test-base.js
@@ -282,7 +282,7 @@ describe('Dicoogle Client, callback API (under Node.js)', function() {
   describe('Index', function() {
     describe('#index() on one provider', function() {
         it("should say ok with no error", function (done) {
-            Dicoogle.index('/opt/another-dataset', 'lucene', function(error) {
+            Dicoogle.index('file:/opt/another-dataset', 'lucene', function(error) {
                 assert.equal(error, null);
                 done();
             });
@@ -302,7 +302,7 @@ describe('Dicoogle Client, callback API (under Node.js)', function() {
   describe('Unindex', function() {
     describe('#unindex() on one provider', function() {
         it("should say ok with no error", function (done) {
-            Dicoogle.unindex('/opt/another-dataset/1_1.dcm', 'lucene', function(error) {
+            Dicoogle.unindex('file:/opt/another-dataset/1_1.dcm', 'lucene', function(error) {
                 assert.equal(error, null);
                 done();
             });
@@ -311,20 +311,46 @@ describe('Dicoogle Client, callback API (under Node.js)', function() {
 
     describe('#unindex() on all providers', function() {
         it("should say ok with no error", function (done) {
-            Dicoogle.unindex('/opt/another-dataset/1_1.dcm', function(error) {
+            Dicoogle.unindex('file:/opt/another-dataset/1_1.dcm', function(error) {
                 assert.equal(error, null);
                 done();
             });
         });
     });
+
+    describe('#unindex() multiple URIs', function() {
+      it("should say ok with no error", function (done) {
+          Dicoogle.unindex([
+            'file:/opt/another-dataset/1_1.dcm',
+            'file:/opt/another-dataset/1_2.dcm',
+          ], function(error) {
+              assert.equal(error, null);
+              done();
+          });
+      });
+    });
   });
 
-  describe('#remove() a file', function() {
-    it("should say ok with no error", function (done) {
-        Dicoogle.remove('/opt/another-dataset/1_1.dcm', function(error) {
-            assert.equal(error, null);
-            done();
-        });
+  describe("Remove", function() {
+    describe('#remove() a file', function() {
+      it("should say ok with no error", function (done) {
+          Dicoogle.remove('file:/opt/another-dataset/1_1.dcm', function(error) {
+              assert.equal(error, null);
+              done();
+          });
+      });
+    });
+    describe('#remove() multiple files', function() {
+      it("should say ok with no error", function (done) {
+          Dicoogle.remove([
+            'file:/opt/another-dataset/1_1.dcm',
+            'file:/opt/another-dataset/1_2.dcm',
+            'file:/opt/another-dataset/1_3.dcm',
+          ], function(error) {
+              assert.equal(error, null);
+              done();
+          });
+      });
     });
   });