correctly serialize MTOM into axios data and add Content-Encoding: gzip support in soap request

Readme.md

@@ -153,7 +153,7 @@ The `options` argument allows you to customize the client with the following pro
 - returnSaxStream: enables the library to return the sax stream, transferring to the end user the responsibility of parsing the XML. It can be used only in combination with *stream* argument set to `true`. Default: `false`
 - parseReponseAttachments: Treat response as multipart/related response with MTOM attachment. Reach attachments on the `lastResponseAttachments` property of SoapClient. Default: `false`
 
-Note: for versions of node >0.10.X, you may need to specify `{connection: 'keep-alive'}` in SOAP headers to avoid truncation of longer chunked responses. 
+Note: for versions of node >0.10.X, you may need to specify `{connection: 'keep-alive'}` in SOAP headers to avoid truncation of longer chunked responses.
 
 ### soap.listen(*server*, *path*, *services*, *wsdl*, *callback*) - create a new SOAP server that listens on *path* and provides *services*.
 *server* can be a [http](https://nodejs.org/api/http.html) Server or [express](http://expressjs.com/) framework based server
@@ -522,6 +522,7 @@ Interesting properties might be:
   ]
   ```
 * `forceMTOM`: set to True if you want to send the request as MTOM even if you don't have attachments
+* `forceGzip`: set to True if you want to force transfer-encoding in gzip (default: ```false```)
 
 
 ### Client.*method*Async(args, options) - call *method* on the SOAP service.
@@ -554,6 +555,7 @@ Interesting properties might be:
   ]
   ```
 * `forceMTOM`: set to True if you want to send the request as MTOM even if you don't have attachments
+* `forceGzip`: set to True if you want to force transfer-encoding in gzip (default: ```false```)
 
 ##### Example with JSON for the `args`
 The example above uses `{name: 'value'}` as the args. This may generate a SOAP messages such as:

src/http.ts

@@ -11,6 +11,7 @@ import { ReadStream } from 'fs';
 import * as url from 'url';
 
 import { v4 as uuidv4 } from 'uuid';
+import { gzipSync } from 'zlib';
 import { IExOptions, IHeaders, IHttpClient, IMTOMAttachments, IOptions } from './types';
 import { parseMTOMResp } from './utils';
 
@@ -100,7 +101,8 @@ export class HttpClient implements IHttpClient {
           }
         }
       }
-      headers['Content-Type'] = 'multipart/related; type="application/xop+xml"; start="<' + start + '>"; start-info="text/xml"; boundary=' + uuidv4();
+      const boundary = uuidv4();
+      headers['Content-Type'] = 'multipart/related; type="application/xop+xml"; start="<' + start + '>"; type="text/xml"; boundary=' + boundary;
       if (action) {
         headers['Content-Type'] = headers['Content-Type'] + '; ' + action;
       }
@@ -119,11 +121,32 @@ export class HttpClient implements IHttpClient {
           'body': attachment.body,
         });
       });
-      // options.multipart = multipart;
+      options.data = `--${boundary}\r\n`;
+
+      let multipartCount = 0;
+      multipart.forEach((part) => {
+        Object.keys(part).forEach((key) => {
+          if (key !== 'body') {
+            options.data += `${key}: ${part[key]}\r\n`;
+          }
+        });
+        options.data += '\r\n';
+        options.data += `${part.body}\r\n--${boundary}${
+          multipartCount === multipart.length - 1 ? '--' : ''
+        }\r\n`;
+        multipartCount++;
+      });
     } else {
       options.data = data;
     }
 
+    if (exoptions.forceGzip) {
+      options.decompress = true;
+      options.data = gzipSync(options.data);
+      options.headers['Accept-Encoding'] = 'gzip,deflate';
+      options.headers['Content-Encoding'] = 'gzip';
+    }
+
     for (const attr in newExoptions) {
       if (mergeOptions.indexOf(attr) !== -1) {
         for (const header in exoptions[attr]) {