@RequestMapping(produces = MediaType.TEXT_HTML_VALUE)
public ModelAndView errorHtml(HttpServletRequest request,
      HttpServletResponse response) {
   HttpStatus status = getStatus(request);
   Map<String, Object> model = Collections.unmodifiableMap(getErrorAttributes(
         request, isIncludeStackTrace(request, MediaType.TEXT_HTML)));
   response.setStatus(status.value());
   ModelAndView modelAndView = resolveErrorView(request, response, status, model);
   return (modelAndView != null) ? modelAndView : new ModelAndView("error", model);
}

AbstractErrorController

/**
	 * Resolve any specific error views. By default this method delegates to
	 * {@link ErrorViewResolver ErrorViewResolvers}.
	 * @param request the request
	 * @param response the response
	 * @param status the HTTP status
	 * @param model the suggested model
	 * @return a specific {@link ModelAndView} or {@code null} if the default should be
	 * used
	 * @since 1.4.0
	 */
	protected ModelAndView resolveErrorView(HttpServletRequest request,
			HttpServletResponse response, HttpStatus status, Map<String, Object> model) {
		for (ErrorViewResolver resolver : this.errorViewResolvers) {
			ModelAndView modelAndView = resolver.resolveErrorView(request, status, model);
			if (modelAndView != null) {
				return modelAndView;
			}
		}
		return null;
	}

DefaultErrorViewResolver 是SpringBoot 中默认的错误信息视图解析器 

@Override
	public ModelAndView resolveErrorView(HttpServletRequest request, HttpStatus status,
			Map<String, Object> model) {
		ModelAndView modelAndView = resolve(String.valueOf(status.value()), model);
		if (modelAndView == null && SERIES_VIEWS.containsKey(status.series())) {
			modelAndView = resolve(SERIES_VIEWS.get(status.series()), model);
		}
		return modelAndView;
	}

	private ModelAndView resolve(String viewName, Map<String, Object> model) {
		String errorViewName = "error/" + viewName;
		TemplateAvailabilityProvider provider = this.templateAvailabilityProviders
				.getProvider(errorViewName, this.applicationContext);
		if (provider != null) {
			return new ModelAndView(errorViewName, model);
		}
		return resolveResource(errorViewName, model);
	}

	private ModelAndView resolveResource(String viewName, Map<String, Object> model) {
		for (String location : this.resourceProperties.getStaticLocations()) {
			try {
				Resource resource = this.applicationContext.getResource(location);
				resource = resource.createRelative(viewName + ".html");
				if (resource.exists()) {
					return new ModelAndView(new HtmlResourceView(resource), model);
				}
			}
			catch (Exception ex) {
			}
		}
		return null;
	}

SpringBoot会在error目录下找 4xx, 5xx文件作为错误视图， 当找不到会回到 errorHtml 使用 error作为默认的错误页面视图名