HTTP: remove special case for 416

It was pointed out that the special case libcurl did for 416 was
incorrect and wrong. 416 is not really different to other errors so the
response body must be handled like for other errors/http responses.

Reported by: Chris Smowton
Bug: http://curl.haxx.se/bug/view.cgi?id=3076808

lib/http.c

@@ -3293,13 +3293,6 @@ CURLcode Curl_http_readwrite_headers(struct SessionHandle *data,
       data->req.deductheadercount =
         (100 <= k->httpcode && 199 >= k->httpcode)?data->req.headerbytecount:0;
 
-      if(data->state.resume_from &&
-         (data->set.httpreq==HTTPREQ_GET) &&
-         (k->httpcode == 416)) {
-        /* "Requested Range Not Satisfiable" */
-        *stop_reading = TRUE;
-      }
-
       if(!*stop_reading) {
         /* Curl_http_auth_act() checks what authentication methods
          * that are available and decides which one (if any) to
@@ -3512,9 +3505,6 @@ CURLcode Curl_http_readwrite_headers(struct SessionHandle *data,
            * message-body, and thus is always terminated by the first
            * empty line after the header fields. */
           /* FALLTHROUGH */
-        case 416: /* Requested Range Not Satisfiable, it has the
-                     Content-Length: set as the "real" document but no
-                     actual response is sent. */
         case 304:
           /* (quote from RFC2616, section 10.3.5): The 304 response
            * MUST NOT contain a message-body, and thus is always
@@ -3546,10 +3536,7 @@ CURLcode Curl_http_readwrite_headers(struct SessionHandle *data,
     /* Curl_convert_from_network calls failf if unsuccessful */
 #endif /* CURL_DOES_CONVERSIONS */
 
-    /* Check for Content-Length: header lines to get size. Ignore
-       the header completely if we get a 416 response as then we're
-       resuming a document that we don't get, and this header contains
-       info about the true size of the document we didn't get now. */
+    /* Check for Content-Length: header lines to get size */
     if(!k->ignorecl && !data->set.ignorecl &&
        checkprefix("Content-Length:", k->p)) {
       curl_off_t contentlength = curlx_strtoofft(k->p+15, NULL, 10);

tests/data/test194

@@ -17,11 +17,12 @@ Server: Apache/1.3.19 (Unix)  (Red-Hat/Linux) mod_ssl/2.8.1 OpenSSL/0.9.6 PHP/4.
 Last-Modified: Fri, 24 Oct 2003 18:01:23 GMT
 ETag: "ab57a-507-3f9968f3"
 Accept-Ranges: bytes
-Content-Length: 87
+Content-Length: 4
 Content-Range: bytes */87
 Content-Type: image/gif
 Connection: close
 
+bad
 </data>
 
 </reply>

tests/data/test92

@@ -17,10 +17,11 @@ Server: Apache/1.3.19 (Unix)  (Red-Hat/Linux) mod_ssl/2.8.1 OpenSSL/0.9.6 PHP/4.
 Last-Modified: Fri, 24 Oct 2003 18:01:23 GMT
 ETag: "ab57a-507-3f9968f3"
 Accept-Ranges: bytes
-Content-Length: 87
+Content-Length: 4
 Content-Range: bytes */87
 Content-Type: image/gif
 
+bad
 </data>
 </reply>