throw internal error on 200 with no content

__tests__/unit/query.test.ts

@@ -123,6 +123,25 @@ describe("query", () => {
     expect(actual.summary).toEqual("the summary");
   });
 
+  it("Throws ServiceError on an empty 200 response", async () => {
+    expect.assertions(2);
+    fetchMock.mockResponse("", {
+      status: 200,
+      headers: [["content-length", "0"]],
+    });
+    try {
+      const result = await client.query(fql`'foo'.length`);
+      console.log("result", result);
+    } catch (e) {
+      if (e instanceof ServiceError) {
+        expect(e.message).toEqual(
+          "There was an issue communicating with Fauna. Please try again.",
+        );
+        expect(e.httpStatus).toEqual(500);
+      }
+    }
+  });
+
   // it("throws an NetworkError on a timeout", async () => {
   //   expect.assertions(2);
   //   // axios mock adapater currently has a bug that cannot match

src/client.ts

@@ -11,6 +11,7 @@ import {
   NetworkError,
   ProtocolError,
   ServiceError,
+  ServiceInternalError,
   ThrottlingError,
   getServiceError,
 } from "./errors";
@@ -639,6 +640,24 @@ in an environmental variable named FAUNA_SECRET or pass it to the Client\
         JSON.stringify(response.headers),
       );
 
+      // Receiving a 200 with no body/content indicates an issue with core router
+      if (
+        response.status === 200 &&
+        response.body.length === 0 &&
+        response.headers["content-length"] === "0"
+      ) {
+        throw new ServiceInternalError(
+          {
+            error: {
+              code: "internal_error",
+              message:
+                "There was an issue communicating with Fauna. Please try again.",
+            },
+          },
+          500,
+        );
+      }
+
       let parsedResponse;
       try {
         parsedResponse = {