diff --git a/lib/parser.js b/lib/parser.js
index f756fcae9..e70fa1e7d 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -46,12 +46,12 @@ module.exports = {
 
 /**
  * Parses and validate an AsyncAPI document from YAML or JSON.
- * 
+ *
  * @param {(String | Object)} asyncapiYAMLorJSON An AsyncAPI document in JSON or YAML format.
  * @param {ParserOptions=} options Configuration options object {@link #asyncapiparserparseroptions--object|ParserOptions}
  * @returns {Promise<AsyncAPIDocument>} The parsed AsyncAPI document.
  */
-async function parse(asyncapiYAMLorJSON, options = {}) {
+async function parse(asyncapiYAMLorJSON, options = {}, urlRegExped) {
   let parsedJSON;
   let initialFormat;
 
@@ -67,7 +67,7 @@ async function parse(asyncapiYAMLorJSON, options = {}) {
         detail: 'Most probably the AsyncAPI document contains invalid YAML or YAML features not supported in JSON.'
       });
     }
-    
+
     if (!parsedJSON.asyncapi) {
       throw new ParserError({
         type: 'missing-asyncapi-field',
@@ -75,7 +75,7 @@ async function parse(asyncapiYAMLorJSON, options = {}) {
         parsedJSON,
       });
     }
-    
+
     if (parsedJSON.asyncapi.startsWith('1.') || !asyncapi[parsedJSON.asyncapi]) {
       throw new ParserError({
         type: 'unsupported-version',
@@ -121,7 +121,7 @@ async function parse(asyncapiYAMLorJSON, options = {}) {
 
 /**
  * Fetches an AsyncAPI document from the given URL and passes its content to the `parse` method.
- * 
+ *
  * @param {String} url URL where the AsyncAPI document is located.
  * @param {Object=} [fetchOptions] Configuration to pass to the {@link https://developer.mozilla.org/en-US/docs/Web/API/Request|fetch} call.
  * @param {ParserOptions=} [options] Configuration to pass to the {@link #asyncapiparserparseroptions--object|ParserOptions} method.
@@ -133,10 +133,22 @@ function parseFromUrl(url, fetchOptions, options) {
   //To not break the API by changing argument position and to silet the linter it is just better to move adding
   if (!fetchOptions) fetchOptions = {};
 
+  // RegExp to choose name of YAML file in the URL string is created.
+  const regexp = /[^/]+$/g;
+  // When executed in multiple async calls, 'checkErrorWrapper' passes URL
+  // string as object by reference. In this case 'String.replace()' method
+  // mutates original URL string causing test with multiple async calls to fail.
+  // Thus fully independent object containing URL string is created for future
+  // manipulation.
+  const urlCopy = new String(url);
+  // In the copy of the URL string name of a YAML file with spec is replaced
+  // with zero, leaving only part of absolute URL before final slash.
+  const urlRegExped = urlCopy.replace(regexp.exec(urlCopy), '');
+
   return new Promise((resolve, reject) => {
     fetch(url, fetchOptions)
       .then(res => res.text())
-      .then(doc => parse(doc, options))
+      .then(doc => parse(doc, options, urlRegExped))
       .then(result => resolve(result))
       .catch(e => {
         if (e instanceof ParserError) return reject(e);
@@ -178,7 +190,7 @@ async function handleCircularRefs(refParser, parsedJSON, initialFormat, asyncapi
 
 /**
  * Creates (or reuses) a function that validates an AsyncAPI document based on the passed AsyncAPI version.
- * 
+ *
  * @private
  * @param {Object} version AsyncAPI version.
  * @returns {Function} Function that validates an AsyncAPI document based on the passed AsyncAPI version.
@@ -219,7 +231,7 @@ async function validateAndConvertMessage(msg, originalAsyncAPIDocument, fileForm
     defaultSchemaFormat,
     originalAsyncAPIDocument,
     parsedAsyncAPIDocument,
-    fileFormat, 
+    fileFormat,
     pathToPayload
   });
 
@@ -229,12 +241,12 @@ async function validateAndConvertMessage(msg, originalAsyncAPIDocument, fileForm
 
 /**
  * Registers a new schema parser. Schema parsers are in charge of parsing and transforming payloads to AsyncAPI Schema format.
- * 
+ *
  * @param {Object} parserModule The schema parser module containing parse() and getMimeTypes() functions.
  */
 function registerSchemaParser(parserModule) {
-  if (typeof parserModule !== 'object' 
-      || typeof parserModule.parse !== 'function' 
+  if (typeof parserModule !== 'object'
+      || typeof parserModule.parse !== 'function'
       || typeof parserModule.getMimeTypes !== 'function')
     throw new ParserError({
       type: 'impossible-to-register-parser',
@@ -263,7 +275,7 @@ function applyTraits(js) {
  * Triggers additional operations on the AsyncAPI channels like traits application or message validation and conversion
  *
  * @private
- * 
+ *
  * @param  {Object} parsedJSON parsed AsyncAPI document
  * @param  {String} asyncapiYAMLorJSON AsyncAPI document in string
  * @param  {String} initialFormat information of the document was originally JSON or YAML
@@ -277,7 +289,7 @@ async function customChannelsOperations(parsedJSON, asyncapiYAMLorJSON, initialF
       if (!op) return;
 
       const messages = op.message ? (op.message.oneOf || [op.message]) : [];
-      if (options.applyTraits) {  
+      if (options.applyTraits) {
         applyTraits(op);
         messages.forEach(m => applyTraits(m));
       }
@@ -294,7 +306,7 @@ async function customChannelsOperations(parsedJSON, asyncapiYAMLorJSON, initialF
  * Triggers additional operations on the AsyncAPI messages located in the components section of the document. It triggers operations like traits application, validation and conversion
  *
  * @private
- * 
+ *
  * @param  {Object} parsedJSON parsed AsyncAPI document
  * @param  {String} asyncapiYAMLorJSON AsyncAPI document in string
  * @param  {String} initialFormat information of the document was originally JSON or YAML