Spring throwing HttpMediaTypeNotAcceptableException: Could not find acceptable representation due to dot in url path [duplicate]

Spring is treating the part after the dot as a file suffix to try to determine what response type you actually want. Here is a decent writeup on content negotiation in Spring.

So what happens is that Spring is trying to present the result to in a content type it can't find a converter to.

To solve this you need to tell spring to turn off suffix-based content negotiation:

@Configurationpublic class ContentNegotiationConfig extends WebMvcConfigurerAdapter {    @Override    void configureContentNegotiation(final ContentNegotiationConfigurer configurer) {        // Turn off suffix-based content negotiation        configurer.favorPathExtension(false);    }}

Update:

I've dug a bit deeper and I think I can explain what's happening.

The default configuration ignores unknown path suffixes, so to explain this we need to know how Spring determines that a path suffix is unknown and that boils down to this piece of code in PathExtensionContentNegotiationStrategy:

@Overrideprotected MediaType handleNoMatch(NativeWebRequest webRequest, String extension)        throws HttpMediaTypeNotAcceptableException {    if (this.useJaf) {        MediaType jafMediaType = JafMediaTypeFactory.getMediaType("file." + extension);        if (jafMediaType != null && !MediaType.APPLICATION_OCTET_STREAM.equals(jafMediaType)) {            return jafMediaType;        }    }    if (!this.ignoreUnknownExtensions) {        throw new HttpMediaTypeNotAcceptableException(getAllMediaTypes());    }    return null;}

So what's happening is likely that the Java Activation Framework is recognising some of your suffixes and returning a media type for them - the .c extension probably returns text/x-c since that's causing an exception.