odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/rest/ODataExceptionWrapper.java [273:289]:
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  private ContentType getContentTypeByUriInfo(final Map<String, String> queryParameters) {
    ContentType cntType = null;
    if (queryParameters != null) {
      if (queryParameters.containsKey(DOLLAR_FORMAT)) {
        String contentTypeString = queryParameters.get(DOLLAR_FORMAT);
        if (DOLLAR_FORMAT_JSON.equals(contentTypeString)) {
          cntType = ContentType.APPLICATION_JSON;
        } else {
          // Any format mentioned in the $format parameter other than json results in an application/xml content type
          // for error messages
          // due to the OData V2 Specification
          cntType = ContentType.APPLICATION_XML;
        }
      }
    }
    return cntType;
  }
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odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/servlet/ODataExceptionWrapper.java [191:206]:
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  private ContentType getContentTypeByUriInfo(final Map<String, String> queryParameters) {
    ContentType cntType = null;
    if (queryParameters != null) {
      if (queryParameters.containsKey(DOLLAR_FORMAT)) {
        String contentTypeString = queryParameters.get(DOLLAR_FORMAT);
        if (DOLLAR_FORMAT_JSON.equals(contentTypeString)) {
          cntType = ContentType.APPLICATION_JSON;
        } else {
          // Any format mentioned in the $format parameter other than json results in an application/xml content type
          // for error messages due to the OData V2 Specification.
          cntType = ContentType.APPLICATION_XML;
        }
      }
    }
    return cntType;
  }
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