No contextual ids specified during installation w/o mod_rewrite

I believe this should be mail system

I get this error during installation (it shouldn't be sending mail there?) and when I directly access /contextual/render.

See issue summary. Sorry about the minor hijack, if this can be generated with the mail system please provide code to reproduce.

when I directly access /contextual/render.

In that case, it's normal, since you indeed did not specify any contextual IDs. A simple HTTP GET request to that route does not make any sense, just like it doesn't make any sense for /system/ajax either.

I can't reproduce this. Please provide exact steps to reproduce.

Ah ha!

I figured out the cause. I'm on a fresh Linux install and I forgot to enable mod_rewrite. Drupal is supposed to install/work without mod_rewrite. It's completely unusable w/o mod_rewrite right now. One issue is this install error.

Detailed steps to reproduce:

1. Get the current Drupal 8.0.x dev.
   

   $ git checkout b61edd72e7
   HEAD is now at b61edd7... Issue #2174589 by Wim Leers, ikeigenwijs, el7cosmos, setvik, YesCT: Split up ckeditor.admin.js
   

2. Disable mod_rewrite
3. Load: http://example.local/core/install.php in your browser.
4. Install Drupal 8. (Standard/default settings with MySQL)
5. Load: http://example.local/admin/reports/dblog in your browser.
6. The most recent message will be the above error, probably at: /admin/reports/dblog/event/25.

You're right, Drupal 8 requires clean URLs.

Hence this is a duplicate of #2094985: Drupal 8 install does not warn if Clean Urls are not supported. There's nothing to fix here.

I'm sorry, but this is a valid issue. The point of #2094985: Drupal 8 install does not warn if Clean Urls are not supported is that Drupal 8 does not require clean URLs. #2099311: User login not working if mod_rewrite is not enabled is related, but a separate issue.

Oh, ok, I didn't realize that was the case.

Can you please copy/paste the exact HTTP request headers + body to /contextual/render? You can see them if you use Google Chrome, open the developer tools, and go to any page where you should see contextual links. Go to the developer tools' "Network" tab, click on the "XHR" subtab, and click on the row that shows the request to /contextual/render. There's the information I need.

Disable mod_rewrite (or equivalent) and install Drupal to reproduce.

Request Headers:

POST /contextual/render HTTP/1.1
Host: d8.local
Connection: keep-alive
Content-Length: 478
Pragma: no-cache
Cache-Control: no-cache
Accept: application/json, text/javascript, */*; q=0.01
Origin: http://d8.local
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/38.0.2125.111 Chrome/38.0.2125.111 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://d8.local/
Accept-Encoding: gzip,deflate
Accept-Language: en-US,en;q=0.8
Cookie: SESS7a0e57ed5e4b2c654fdca0e251719ffb=EUot_1v7FVoncwwO0kvg54fclO31xt-LX0xlAcqaMwk

Response Headers:

HTTP/1.1 400 Bad Request
Date: Wed, 26 Nov 2014 21:40:13 GMT
Server: Apache/2.4.7 (Ubuntu)
X-Powered-By: PHP/5.5.9-1ubuntu4.5
Cache-Control: must-revalidate, no-cache, post-check=0, pre-check=0, private
X-UA-Compatible: IE=edge,chrome=1
Content-language: en
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Connection: close
Transfer-Encoding: chunked
Content-Type: application/json

Response:

{}

Copy as cURL:

curl 'http://d8.local/contextual/render' -H 'Pragma: no-cache' -H 'Origin: http://d8.local' -H 'Accept-Encoding: gzip,deflate' -H 'Accept-Language: en-US,en;q=0.8' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/38.0.2125.111 Chrome/38.0.2125.111 Safari/537.36' -H 'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' -H 'Accept: application/json, text/javascript, */*; q=0.01' -H 'Cache-Control: no-cache' -H 'X-Requested-With: XMLHttpRequest' -H 'Cookie: SESS7a0e57ed5e4b2c654fdca0e251719ffb=EUot_1v7FVoncwwO0kvg54fclO31xt-LX0xlAcqaMwk' -H 'Connection: keep-alive' -H 'Referer: http://d8.local/' --data 'ids%5B%5D=block%3Ablock%3Dbartik_account_menu%3A%7Cmenu%3Amenu%3Daccount%3A&ids%5B%5D=block%3Ablock%3Dbartik_main_menu%3A%7Cmenu%3Amenu%3Dmain%3A&ids%5B%5D=entity.view.edit_form%3Aview%3Dfrontpage%3Alocation%3Dpage%26name%3Dfrontpage%26display_id%3Dpage_1&ids%5B%5D=block%3Ablock%3Dbartik_search%3A&ids%5B%5D=block%3Ablock%3Dbartik_tools%3A%7Cmenu%3Amenu%3Dtools%3A&ids%5B%5D=block%3Ablock%3Dbartik_footer%3A%7Cmenu%3Amenu%3Dfooter%3A&ids%5B%5D=block%3Ablock%3Dbartik_powered%3A' --compressed

This is definitely caused by #2099311: User login not working if mod_rewrite is not enabled since forms submissions are broken without mod_rewrite. I'm closing since it's effectively a duplicate. Will re-open if the form submission fix doesn't correct this specific issue.