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fix: Allow POST requests without Content-Type header when body is empty #759

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Merged
kabir merged 2 commits into from
Mar 18, 2026
Merged

fix: Allow POST requests without Content-Type header when body is empty #759

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e9b208a
fix: Allow POST requests without Content-Type header when body is empty
kabir Mar 17, 2026
54495dd
Update reference/rest/src/main/java/io/a2a/server/rest/quarkus/A2ASer…
kabir Mar 17, 2026
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21 changes: 20 additions & 1 deletion reference/rest/src/main/java/io/a2a/server/rest/quarkus/A2AServerRoutes.java
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Original file line number Diff line number Diff line change
Expand Up @@ -346,7 +346,7 @@ public void getTask(RoutingContext rc) {
*/
@Route(regex = "^\\/(?<tenant>[^\\/]*\\/?)tasks\\/(?<taskId>[^/]+):cancel$", order = 1, methods = {Route.HttpMethod.POST}, type = Route.HandlerType.BLOCKING)
public void cancelTask(@Body String body, RoutingContext rc) {
if (!validateContentType(rc)) {
if (!validateContentTypeForOptionalBody(rc, body)) {
return;
}
String taskId = rc.pathParam("taskId");
Expand Down Expand Up @@ -624,6 +624,25 @@ private boolean validateContentType(RoutingContext rc) {
return true;
}

/**
* Check if the request content type is application/json when body content is present.
* Per RFC 9110 §8.3, Content-Type is only meaningful when a message body is present.
* Use this for endpoints where the body is optional.
*
* @param rc the routing context
* @param body the request body (may be null or empty)
* @return true if validation passes, false if Content-Type error should be returned
*/
private boolean validateContentTypeForOptionalBody(RoutingContext rc, @Nullable String body) {
// If body is null or empty, Content-Type is not required
if (body == null || body.isBlank()) {
return true;
}

// Body has content - validate Content-Type
return validateContentType(rc);
}

/**
* Retrieves the public agent card for agent discovery.
*
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