fix(fix-request-body): support '+json' content-type suffix (#1015)

* fix(fix-request-body): add fix for '+json' ending * test: add unit test * fix: fix ut error * docs: Update CHANGELOG.md --------- Co-authored-by: Steven Chim <655241+chimurai@users.noreply.github.com>

Author: howiezhao

CHANGELOG.md

@@ -8,6 +8,7 @@
 - ci(package): npm package provenance
 - fix(logger-plugin): log target port when router option is used
 - refactor: fix circular dependencies
+- fix(fix-request-body): support '+json' content-type suffix
 
 ## [v3.0.0](https://github.com/chimurai/http-proxy-middleware/releases/tag/v3.0.0)
 

src/handlers/fix-request-body.ts

@@ -23,7 +23,7 @@ export function fixRequestBody<TReq = http.IncomingMessage>(
  proxyReq.write(bodyData);
  };
 
- if (contentType && contentType.includes('application/json')) {
+ if (contentType && (contentType.includes('application/json') || contentType.includes('+json'))) {
  writeBody(JSON.stringify(requestBody));
  }
 

test/unit/fix-request-body.spec.ts

@@ -57,6 +57,20 @@ describe('fixRequestBody', () => {
  expect(proxyRequest.write).toHaveBeenCalledWith(expectedBody);
  });
 
+ it('should write when body is not empty and Content-Type ends with +json', () => {
+ const proxyRequest = fakeProxyRequest();
+ proxyRequest.setHeader('content-type', 'application/merge-patch+json; charset=utf-8');
+
+ jest.spyOn(proxyRequest, 'setHeader');
+ jest.spyOn(proxyRequest, 'write');
+
+ fixRequestBody(proxyRequest, createRequestWithBody({ someField: 'some value' }));
+
+ const expectedBody = JSON.stringify({ someField: 'some value' });
+ expect(proxyRequest.setHeader).toHaveBeenCalledWith('Content-Length', expectedBody.length);
+ expect(proxyRequest.write).toHaveBeenCalledWith(expectedBody);
+ });
+
  it('should write when body is not empty and Content-Type is application/x-www-form-urlencoded', () => {
  const proxyRequest = fakeProxyRequest();
  proxyRequest.setHeader('content-type', 'application/x-www-form-urlencoded');