Questions tagged [http-headers]
In the Hypertext Transfer Protocol (HTTP), HTTP header fields contain the operating parameters of an HTTP request or response. With the request or response line (first line of message), they form the message header.
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25 views
Why Vary Header is different for CURL --head and Chrome's F12 Dev Tools
I am trying to study the HTTP response headers in popular websites. The objective is that I can cross-check with my website and adapt good things.
I tried to find how Vary header looks in the response ...
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1answer
41 views
Default cache-control directives (and behaviour) when header returns only private
I just checked the cache-control header returned by webmasters.stackexchange.com. The only directive present in the response is cache-control: private. In this case, what are the default values for ...
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46 views
SEO Impact of Vary: User-Agent header
Vary: User-Agent header is used to tell browsers, CDNs, etc., (for caching purposes) that the content differs by user agents (especially for mobile and desktop versions). But do search engine robots ...
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1answer
24 views
Minor variations in content based on user-agent - SEO Precautions like http vary header
I am planning minor variations to HTML based on user-agent. Specifically, I would not be implementing ad codes (adsense and other third party ads) for certain user-agents (certain old browsers both on ...
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0answers
18 views
Dynamic Serving via 'vary http': Is still valid? Why the industry prefer full responsive websites instead?
I have a client that asked me to develop a website using a dynamic serving technique, basically he uses the vary http header in order to serve different versions of the front-end discerning them based ...
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1answer
30 views
HTTP “Vary: User-Agent” header for a Single Page React App that does SSR for robots?
I have React web app. It's a single page app, so there's basically an "empty" HTML file with a JS bundle that does it all.
But to improve SEO capabilities, I'm doing SSR for robot crawlers ...
3
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0answers
110 views
Cross origin resource policy violation for JS file when setting COEP, COOP and CORP headers
What is the best way to deal with the new security headers?
Cross-Origin-Embedder-Policy (COEP) https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy
Cross-Origin-...
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21 views
Can you specify the max-snippet length in a X-robots-tag header?
The specs by Google does not address this issue. So, I would like to know what is the x-robots-tag equivalent for:
<meta name="googlebot" content="max-snippet:20"/>
Is it ...
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1answer
81 views
POSTing authorization headers with no $_SERVER['HTTP_AUTHORIZATION'] and no 'authorization' value in apache_request_headers()
I'm developing a web application that interacts with a GraphQL instance on another server (not mine). The GraphQL instance requires me to send an authorization header ("Bearer [token]"). The ...
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85 views
Chrome dev tools reports “Stalled' and ”Initial connection" under mobile mode only
One of my static pages(generated by Hugo) is loading slow on mobile mode, but the exact same page was fine on desktop mode. (google page load speed desktop score 97, but failed Core Web Vitals on ...
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27 views
Prevent indexing of text loaded by javascript from XHR-ed JSON file
I have a web document, https://example.com/page.html, where a javascript, like <script src="https://example.com/script.js"> loads a <div class="content"></div> ...
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1answer
37 views
Double redirect - referrer in headers
let's say we have redirects like this:
(1) my shortener link -> (2) bit.ly -> (3) target URL
Is it possible to check on the end (3) that user visit came from (1) my shortened link?
2
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1answer
110 views
What is difference between robots.txt, sitemap, robots meta tag, robots header tag?
So I am trying to learn SEO and I am honestly confused and have following 8 questions.
Do I tell a bot not to visit a certain link through X-Robots-Tag or through robot meta tag or robots.txt?
Is it ...
2
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1answer
198 views
When my origin serves a “304 Not Modified”, Cloudflare sends “200 OK” and makes the user download the page again
I'm using Cloudflare to cache certain APIs. I'm setting the below headers in my Origin server:
Cache-Control: public, must-revalidate, max-age=300
Basically, I'm instructing the browser here to cache ...
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1answer
55 views
How does the server distinguish between 2 host names being pointed to the same IP address?
How does a Windows server distinguish between 2 host names being directed by DNS to the same IP address?
I started a new job recently. We have files.example.com pointing to x.x.x.x IP address. I got ...
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0answers
36 views
Chrome gives a content-security-policy warning when viewing an image in its own tab on my site
I'm setting Content-Security-Policy in htaccess.
I use a pretty basic and strict policy:
Header always set Content-Security-Policy
"default-src 'self';
script-src 'self' http: https: *.googleapis....
5
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1answer
1k views
Why does Chrome show 304 in Response Headers section but 200 in Status code?
Why does Chrome show 304 in Response Headers section but 200 in Status code? Why doesn't it show 304 in Status code (BTW, that is NOT 200 memory cache.)?
If it shows 200 I can't know it is ...
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1answer
86 views
Are these expiration headers wrong or could they hurt SEO?
I cannot figure out why my rankings dropped, at the same time I deployed 4 Nginx cache servers on different continents.
When I serve the PHP pages, I set this expiration header from the origin server,...
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1answer
1k views
What headers used in request by google bot?
What headers used in request by google bot? Must be user agent, but what else? I'm interested in cache control headers, does bot try to get fresh page, but not from cache?
The related question: Do ...
2
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1answer
626 views
Can a JS redirect to a not found page work in place of a real 404?
I need assistance with some issues on a Big Commerce site.
To preface, it is not my site and the IT team has a complex technology stack being utilized to build the site.
The issue is that adding an ...
5
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2answers
356 views
Do browsers send different HTTP headers on page reload so that server side caches can be flushed?
I'm implementing caching at the server application level, because my hosting doesn't provide Apache caching modules and it's not possible to use a reverse proxy there. Its cheap and fast hosting, so I ...
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0answers
45 views
Apache: using %{DOCUMENT_ROOT} inside <Directory> section
My virtualhost configuration file sites-available/site.conf contains (some lines omitted):
<VirtualHost *:443>
<Directory /var/www/html/my_website>
# set options
</Directory>...
2
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1answer
82 views
If the content is fetched by wget, could there be an issue if I don't know the content-type in the HTTP response?
It's a question about wget. I have a simple file uuid.html in the document root that contains a single line 54da5638-099d-4cf3-9319-c436fcb81334. I get the line in a shell script with content=$(wget ...
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1answer
20 views
What the HTTP specification says about HTTP requests on a plain text without header
Some times in small shell scripts, I use an http request on a raw text file with no header, only a uuid string for identification. For example, in the apache document root, I might have a file
uuid....
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0answers
128 views
Using Post method in Faceook Graph API
When I use graph API to post on a Facebook page it's not working, it responds with an ID and URL but instead it should be responding with a post id.
When I open the URL it gives this error:
{
"...
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0answers
16 views
Download link expired, going back to software presentation page, what redirect method to use?
When someone (user or bot) reaches an old download link like /download/yellow-wallpaper.zip?key=some-expired-download-key , user is sent back to file details page, e.g /yellow-wallpaper.html, where ...
5
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1answer
699 views
Will it hurt SEO to remove the '.html' extension from static pages such that they get served as 'text/x-generic'?
If we want to go with static website, we generate static html files of pages with names like contacts.html and we may add to our .htaccess file the lines like
RewriteEngine On
RewriteRule ^(([^/]+/)*[...
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0answers
1k views
Append basic authentication header NGINX to existing authentication header of upstream application
Assume the following setup:
The NGINX reverse proxy is asking for basic authentication (which is a good habit when you expose things on the internet). Basic authentication uses the Authorization ...
3
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1answer
2k views
Request Missing a User Agent Header
I activated ModSecurity on a cheap web hosting but I have no control over it: that is, the only thing the service provider lets you do is reading logs but, unfortunately, you can't really configure ...
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0answers
29 views
Header to describe available `content-type` responses?
It's a little cumbersome to scrape through the HTTP RFC for this particular question, so I'm hoping someone can help me short-circuit an answer:
Does the HTTP spec contain functionality for a server ...
3
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1answer
97 views
Status code vs. Response Header Status: what is the rule for bots?
Assuming we have a page, which has as Status Code 200 OK and as Response Headers Status HTTP/1.1 410 Gone, like on image:
What is the behavior of bots / Googlebot? To crawl/index or not?
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2answers
303 views
Chrome isn't loading static content due to HTTP2_SESSION_RECV_INVALID_HEADER - Invalid character in header name - last-modified
HTTP2_SESSION_RECV_INVALID_HEADER
--> error = "Invalid character in header name."
--> header_name = "last-modified:"
--> header_value = "Thursday,%2009-Aug-2018%2001:21:53%20GMT"
This error ...
4
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0answers
97 views
Responding other 'Content-Type' different from 'Accept' list
As all you know (else follow this question) the requesting Accept header allows client to specify the expected MIME types for response content.
But my case is:
client indicates an Accept of type ...
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2answers
73 views
Should I be concerned that Google Ads sometimes shows Passive mixed content (insecure images) in some Ads?
In some pages that have Google Ads, Chrome Dev Tools console shows the warning for a Passive Mixed Content:
Mixed Content: The page at '...' was loaded over HTTPS, but requested
an insecure image
...
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1answer
3k views
Does a 504 Gateway Timeout error mean a server has crached?
I am running a php script on a website that creates thumbnails from a big image. The script uses imagick to generates 10 thumbnails per image.
It runs on first page load, when the thumbnails don't ...
2
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1answer
2k views
404 status code for HTTP/2
How does a correct 404 status code look like on using HTTP/2 protocol? HTTP/1.1 404 Not Found seems to be for the previous protocol version, but I can't find anywhere something meaningful about status ...
3
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2answers
306 views
HTTP-header canonical and link tag canonical on same page?
I've come across websites using both a HTTP-header based canonical as well as a tag-based canonical. Sometimes they are not referencing the same URL which brings me to my question - does one have ...
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1answer
1k views
How to disable http method verb tunneling in nginx
Our security team ran a web-inspect security scan on our site and asked us to disable verb tunneling using headers or query parameters such as X-HTTP-Method, XHTTP-Method-Override, X-Method-Override, ...
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0answers
202 views
Why is my Last-Modified header always sent using GMT timezone?
I want to send the last-modified in IST timezone, But it always sends in GMT. What is wrong with this PHP code?
echo "Timezone " . date_default_timezone_get () ; //==>verified, timezone set ...
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1answer
2k views
Apache Reverse Proxy Rewrite Remote_User
Running httpd 2.4.6 on CentOS 7 as a reverse proxy for Splunk with SSO.
This works with no proxying:
RewriteCond %{LA-U:REMOTE_USER} "user" [NC]
RewriteRule ^.*$ - [F,L]
The above does NOT work ...
2
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1answer
567 views
Is it OK for SEO to send a 200 status when I'm actually rewriting the request to a controller and then outputting content to a page dynamically?
After reading endless pages about redirects and best practice, I'm still unsure if what I'm doing here is good, bad, or indifferent as far as SEO is concerned.
I have a table in a database that holds ...
2
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3answers
1k views
Why does Pingdom suggest that I add a “Vary: Accept-Encoding” header?
I have tried a tool to measure the speed of my web site. It is Pingdom https://tools.pingdom.com
There is an answer I do not understand
"The following publicly cacheable, compressible resources ...
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1answer
2k views
X-Frame-Options Enabling on GoDaddy
I am currently developing a website which runs on a GoDaddy Windows with Plesk hosting option. I am doing this as an experimental/learning site so I am trying to be as security conscious as possible ...
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3answers
68 views
Website <head> section questions
I've been doing some tidying up on my site recently and have been making some minor adjustments to the section of each page (primarily to cut out any potential duplication). However, I just have a ...
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0answers
29 views
Google Analytics stopped registering hits 10 minutes after implementing measurement protocol
I'm trying to implement google analytics on server-side. In order to (loosely) identify visitors, I'm generating an md5 based on IP and user-agent and send the result to Google for tracking the ...
2
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1answer
213 views
Deleting many pages SEO check
I need to delete many pages (recipes) on my website because the recipes were made with products that don't exist any more. Links to those pages are all over social media so I can't just use a 410 ...
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1answer
2k views
When should I not to use page meta security headers
When should I not to use page meta security headers?
For example, I configured the web server server-side with a powerful content security policy and other hardened security headers, but when review ...
9
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1answer
997 views
How is HTTP 418 treated by Google and others as it is not a “real” error?
I was wondering if you know how Google and other search engines treat a website with HTTP status code 418 I'm a teapot.
According to this Wikipedia article, it can be used as a client error code (...
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3answers
744 views
Does setting a Referrer-Policy header have any effect on non-HTML pages?
The Referrer-Policy header controls how much referrer information the browser exposes to a site when navigating to it. I understand the purpose of this header when set on HTML files; does it make ...
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1answer
126 views
Access resources of secondary server running different port apache2
I'm currently running a main server from a raspberry pi (32 GB) and a secondary server (4 TB) running as the file storage server. Both servers are running Debian Linux with Apache2 installed. I've ...
