IllegalStateException: Duplicate key when two endpoints at the same URL with same header exist. Fixes #1985.

Author: bnasslahsen

springdoc-openapi-starter-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java

@@ -1047,7 +1047,14 @@ private void fillParametersList(Operation operation, Map<String, String> queryPa
 		if (parametersList == null)
 			parametersList = new ArrayList<>();
 		Collection<Parameter> headersMap = AbstractRequestService.getHeaders(methodAttributes, new LinkedHashMap<>());
-		parametersList.addAll(headersMap);
+		headersMap.forEach(parameter -> {
+			Optional<Parameter> existingParam;
+			if (!CollectionUtils.isEmpty(operation.getParameters())){
+				existingParam = operation.getParameters().stream().filter(p -> parameter.getName().equals(p.getName())).findAny();
+				if (existingParam.isEmpty())
+					operation.addParametersItem(parameter);
+			}
+		});
 		if (!CollectionUtils.isEmpty(queryParams)) {
 			for (Map.Entry<String, String> entry : queryParams.entrySet()) {
 				io.swagger.v3.oas.models.parameters.Parameter parameter = new io.swagger.v3.oas.models.parameters.Parameter();

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/models/MethodAttributes.java

@@ -33,6 +33,7 @@
 import io.swagger.v3.oas.models.responses.ApiResponse;
 import io.swagger.v3.oas.models.responses.ApiResponses;
 import org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.StringUtils;
 
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.util.CollectionUtils;
@@ -387,9 +388,16 @@ public Map<String, String> getHeaders() {
 	private void setHeaders(String[] headers) {
 		if (ArrayUtils.isNotEmpty(headers))
 			for (String header : headers) {
-				String[] keyValueHeader = header.split("=");
-				String headerValue = keyValueHeader.length > 1 ? keyValueHeader[1] : "";
-				this.headers.put(keyValueHeader[0], headerValue);
+				if (!header.contains("!=")) {
+					String[] keyValueHeader = header.split("=");
+					String headerValue = keyValueHeader.length > 1 ? keyValueHeader[1] : "";
+					this.headers.put(keyValueHeader[0], headerValue);
+				}
+				else {
+					String[] keyValueHeader = header.split("!=");
+					if (!this.headers.containsKey(keyValueHeader[0]))
+						this.headers.put(keyValueHeader[0], StringUtils.EMPTY);
+				}
 			}
 	}