I use Spring to call a REST API which reply with header that contains "Content-Type: multipart/mixed; boundary==\_123456789".

My problem is that Spring try to parse the Content-Type and throw InvalidMediaTypeException due to '=' in boundary token.

Is there a way to disable this checking (or any workaround) ?

These are my logs :

```
org.springframework.http.InvalidMediaTypeException: Invalid mime type "multipart/mixed; boundary==_11204303fda4403b6a72d61500081354": Invalid token character '=' in token "=_11204303fda4403b6a72d61500081354"
    at org.springframework.http.MediaType.parseMediaType(MediaType.java:620)
    at org.springframework.http.HttpHeaders.getContentType(HttpHeaders.java:992)
    at org.springframework.web.client.HttpMessageConverterExtractor.getContentType(HttpMessageConverterExtractor.java:136)
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:93)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:1037)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:1020)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:778)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711)
    at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:468)

```