cb99f0b11bdeee5dfa76064d38b6410da0f4a709
max
  Thu Sep 10 00:55:21 2026 -0700
Centralize CGI Content-Type printing in one cgiPrintContentType() helper

Around 90 places across the tree hand-rolled the CGI response header, each
with its own spelling: "Content-Type:" or "Content-type:", \n or \r\n, and
the terminating blank line written as part of the same string, as a separate
puts("\n") (which emits two newlines, so a stray blank line led the body) or
as printf("\r\n\r\n") (two blank lines).  A handful forgot the terminator
entirely and relied on a following header to supply it.

cgiPrintContentType() in lib/cheapcgi.c now writes the Content-Type line and
the blank line that ends the header.  Header lines are not ordered, so the
callers that also send Status, Set-Cookie, Content-Disposition, Content-Length
or X-Sendfile write those first and call this last to close the header; that
keeps it to a single helper rather than a print-the-line / end-the-header pair
that a caller can half-use.  cart.c's existing httpHeaders list already worked
this way.

Only the CGI response path is touched.  The dyStringPrintf("Content-type: ...")
calls that build outgoing HTTP *requests* (genomeSpace, oauthLogin, eapMetaSync,
edwWebAuthLogin, ga4ghToBed) are unrelated and left alone.

Also fills out the apiKey error message in botDelay.c to say where to create a
key and that keys are server-specific.

No behavior change on the wire beyond dropping those stray blank lines and
adding the missing newline after Retry-After.

diff --git src/webBlat/webBlat.c src/webBlat/webBlat.c
index ceb002ee57e..4f33e41653c 100644
--- src/webBlat/webBlat.c
+++ src/webBlat/webBlat.c
@@ -463,32 +463,31 @@
        "sequences at once if they are in fasta format (where each sequence has "
        "a header line that starts with > and contains the name of the sequence)");
 
 printf("</FORM>");
 }
 
 void webBlat()
 /* Parse out CGI variables and decide which page to put up. */
 {
 if (cgiVarExists("wb_help"))
     htmShell("Web BLAT Help", doHelp, NULL);
 else if (cgiVarExists("wb_seq"))
     htmShell("Web BLAT Results", doBlat, NULL);
 else if (cgiVarExists("wb_doDetailLine"))
     {
-    puts("Content-Type:text/html");
-    puts("\n");
+    cgiPrintContentType("text/html");
     doDetailLine();
     }
 else
     htmShell("Web BLAT", doGetSeq, NULL);
 }
 
 int main(int argc, char *argv[])
 /* Process command line. */
 {
 boolean isFromWeb = cgiIsOnWeb();
 htmlPushEarlyHandlers();
 dnaUtilOpen();
 if (!isFromWeb && !cgiSpoof(&argc, argv))
     usage();
 cfg = gfWebConfigRead("webBlat.cfg");