Ktor-3854 Fix: separate HttpCookie rendered cookie pairs with space

ktor-client/ktor-client-core/common/src/io/ktor/client/plugins/cookies/HttpCookies.kt

@@ -119,7 +119,7 @@ public class HttpCookies internal constructor(
 }
 
 private fun renderClientCookies(cookies: List<Cookie>): String =
-    cookies.joinToString(";", transform = ::renderCookieHeader)
+    cookies.joinToString("; ", transform = ::renderCookieHeader)
 
 /**
  * Gets all the cookies for the specified [url] for this [HttpClient].

ktor-client/ktor-client-core/common/test/CookiesTest.kt

@@ -42,18 +42,31 @@ class CookiesTest {
         assertEquals("test=value", builder.headers[HttpHeaders.Cookie])
     }
 
+    @Test
+    fun testCookiesAreRenderedWithSpaceInBetween() = testSuspend{
+        var storage = AcceptAllCookiesStorage()
+        storage.addCookie("http://localhost/", Cookie("name1", "value1"))
+        storage.addCookie("http://localhost/", Cookie("name2", "value2"))
+        val feature = HttpCookies(storage, emptyList())
+        var builder = HttpRequestBuilder()
+
+        feature.sendCookiesWith(builder)
+
+        assertContains(builder.headers[HttpHeaders.Cookie]!!, "; ")
+    }
+
     @Test
     fun testRequestCookiesArePreservedWhenAddingCookiesFromStorage() = testSuspend {
         val storage = AcceptAllCookiesStorage()
-        storage.addCookie("http://localhost/", parseServerSetCookieHeader("SOMECOOKIE=somevalue;"))
+        storage.addCookie("http://localhost/", Cookie("SOMECOOKIE", "somevalue"))
         val feature = HttpCookies(storage, emptyList())
         val builder = HttpRequestBuilder()
 
         builder.cookie("test", "value")
         feature.captureHeaderCookies(builder)
         feature.sendCookiesWith(builder)
 
-        val renderedCookies = builder.headers[HttpHeaders.Cookie]!!.split(";")
+        val renderedCookies = builder.headers[HttpHeaders.Cookie]!!.split("; ")
         assertContains(renderedCookies, "test=value")
         assertContains(renderedCookies, "SOMECOOKIE=somevalue")
     }

ktor-client/ktor-client-tests/common/test/io/ktor/client/tests/plugins/CookiesMockTest.kt

@@ -22,7 +22,7 @@ class CookiesMockTest {
                     assertEquals("*/*", request.headers[HttpHeaders.Accept])
                     val rawCookies = request.headers[HttpHeaders.Cookie]!!
                     assertEquals(1, request.headers.getAll(HttpHeaders.Cookie)?.size!!)
-                    assertEquals("first=\"1,2,3,4\";second=abc", rawCookies)
+                    assertEquals("first=\"1,2,3,4\"; second=abc", rawCookies)
 
                     respondOk()
                 }

ktor-client/ktor-client-tests/common/test/io/ktor/client/tests/plugins/CookiesTest.kt

@@ -192,7 +192,7 @@ class CookiesTest : ClientLoader() {
         test { client ->
             client.prepareGet("$TEST_HOST/encoded").execute { httpResponse ->
                 val response = httpResponse.bodyAsText()
-                val cookieStrings = response.split(";").filter { it.isNotBlank() }
+                val cookieStrings = response.split("; ").filter { it.isNotBlank() }
                 assertEquals(4, cookieStrings.size)
                 assertEquals("uri=first%2C+cookie", cookieStrings[0])
                 assertEquals("raw=first%2C+cookie", cookieStrings[1])

ktor-client/ktor-client-tests/jvm/test/io/ktor/client/tests/CookiesAndRedirectMockedTest.kt

@@ -76,7 +76,7 @@ class CookiesAndRedirectMockedTest {
         val storage = AcceptAllCookiesStorage()
         config {
             server { request ->
-                val cookies = request.headers[HttpHeaders.Cookie]!!.split(";")
+                val cookies = request.headers[HttpHeaders.Cookie]!!.split("; ")
                 assertContains(cookies, "test=value")
                 assertContains(cookies, "other=abc")
                 respondOk()